Question: When did the majority party in the House of Representatives gain control of the body which approves members of the Cabinet?

Knowledge 1: Cabinet of the United States
The heads of the executive departments and all other federal agency heads are nominated by the President and then presented to the Senate for confirmation or rejection by a simple majority (although before the use of the ``nuclear option ''during the 113th US Congress, they could have been blocked by filibuster, requiring cloture to be invoked by ​ ⁄ supermajority to further consideration). If approved, they receive their commission scroll, are sworn in and then begin their duties. [SEP] Knowledge 2: 114th United States Congress
The One Hundred Fourteenth United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from January 3, 2015, to January 3, 2017, during the final two full years of Barack Obama's presidency. The 2014 elections gave the Republicans control of the Senate (and control of both houses of Congress) for the first time since the 109th Congress. With 248 seats in the House of Representatives and 54 seats in the Senate, this Congress began with the largest Republican majority since the 71st Congress of 1929 -- 1931. [SEP] Knowledge 3: 2014 United States Senate elections
The Republicans regained the majority of the Senate in the 114th Congress, which started in January 2015; the Republicans had not controlled the Senate since January 2007. They had needed a net gain of at least six seats to obtain a majority. They held all of their seats, and gained nine Democratic - held seats. Republicans defeated five Democratic incumbents:
Knowledge 1: Cabinet of the United States
The heads of the executive departments and all other federal agency heads are nominated by the President and then presented to the Senate for confirmation or rejection by a simple majority (although before the use of the ``nuclear option ''during the 113th US Congress, they could have been blocked by filibuster, requiring cloture to be invoked by ​ ⁄ supermajority to further consideration). If approved, they receive their commission scroll, are sworn in and then begin their duties. [SEP] Knowledge 2: 2014 United States Senate elections
The Republicans regained the majority of the Senate in the 114th Congress, which started in January 2015; the Republicans had not controlled the Senate since January 2007. They had needed a net gain of at least six seats to obtain a majority. They held all of their seats, and gained nine Democratic - held seats. Republicans defeated five Democratic incumbents: [SEP] Knowledge 3: United States Congress
The Congress meets in the United States Capitol in Washington, D.C. Both senators and representatives are chosen through direct election, though vacancies in the Senate may be filled by a gubernatorial appointment. Congress has 535 voting members: 435 Representatives and 100 Senators. The House of Representatives has six non-voting members representing Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, the U.S. Virgin Islands, and Washington, D.C. in addition to its 435 voting members. Although they can not vote, these members can sit on congressional committees and introduce legislation.
Knowledge 1: Cabinet of the United States
The heads of the executive departments and all other federal agency heads are nominated by the President and then presented to the Senate for confirmation or rejection by a simple majority (although before the use of the ``nuclear option ''during the 113th US Congress, they could have been blocked by filibuster, requiring cloture to be invoked by ​ ⁄ supermajority to further consideration). If approved, they receive their commission scroll, are sworn in and then begin their duties. [SEP] Knowledge 2: 114th United States Congress
The One Hundred Fourteenth United States Congress was a meeting of the legislative branch of the United States federal government, composed of the United States Senate and the United States House of Representatives. It met in Washington, D.C. from January 3, 2015, to January 3, 2017, during the final two full years of Barack Obama's presidency. The 2014 elections gave the Republicans control of the Senate (and control of both houses of Congress) for the first time since the 109th Congress. With 248 seats in the House of Representatives and 54 seats in the Senate, this Congress began with the largest Republican majority since the 71st Congress of 1929 -- 1931. [SEP] Knowledge 3: United States Congress
The Congress meets in the United States Capitol in Washington, D.C. Both senators and representatives are chosen through direct election, though vacancies in the Senate may be filled by a gubernatorial appointment. Congress has 535 voting members: 435 Representatives and 100 Senators. The House of Representatives has six non-voting members representing Puerto Rico, American Samoa, Guam, the Northern Mariana Islands, the U.S. Virgin Islands, and Washington, D.C. in addition to its 435 voting members. Although they can not vote, these members can sit on congressional committees and introduce legislation.

Answer: January 2015