Question: Who is the paternal grandfather of Archduchess Maria Antonia Of Austria (1899–1977)?

Knowledge 1: Archduchess Maria Antonia of Austria (1899–1977)
Archduchess Maria Antonia of Austria (13 July 1899 – 22 October 1977) was a daughter of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain.She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.In 1919, after the fall of the Austro Hungary Empire, she moved with her family to Spain.In 1924 she married Ramón de Orlandis y Villalonga, a Spanish aristocrat.When she became a widow during the Spanish civil war Archduchess Maria Antonia moved permanently to South America where she remarried. [SEP] Knowledge 2: Archduke Leopold Salvator of Austria
Archduke Leopold Salvator, Prince of Tuscany(Leopold Salvator Maria Joseph Ferdinand Franz von Assisi Karl Anton von Padua Johann Baptist Januarius Aloys Gonzaga Rainer Wenzel Galius von Österreich-Toskana)(15 October 1863 – 4 September 1931), was the son of Archduke Karl Salvator of Austria and Princess Maria Immaculata of Bourbon-Two Sicilies.
Knowledge 1: Archduke Leopold Salvator of Austria
Archduke Leopold Salvator, Prince of Tuscany(Leopold Salvator Maria Joseph Ferdinand Franz von Assisi Karl Anton von Padua Johann Baptist Januarius Aloys Gonzaga Rainer Wenzel Galius von Österreich-Toskana)(15 October 1863 – 4 September 1931), was the son of Archduke Karl Salvator of Austria and Princess Maria Immaculata of Bourbon-Two Sicilies. [SEP] Knowledge 2: Archduke Franz Karl of Austria
Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine.He was the father of two emperors:Franz Joseph I of Austria and Maximilian I of Mexico.Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I – and the great-grandfather of the last Habsburg emperor Karl I.
Knowledge 1: Archduchess Maria Antonia of Austria (1899–1977)
Archduchess Maria Antonia of Austria (13 July 1899 – 22 October 1977) was a daughter of Archduke Leopold Salvator of Austria and Infanta Blanca of Spain.She was member of the Tuscan branch of the Imperial House of Habsburg, an Archduchess of Austria and Princess of Tuscany by birth.In 1919, after the fall of the Austro Hungary Empire, she moved with her family to Spain.In 1924 she married Ramón de Orlandis y Villalonga, a Spanish aristocrat.When she became a widow during the Spanish civil war Archduchess Maria Antonia moved permanently to South America where she remarried. [SEP] Knowledge 2: Archduke Franz Karl of Austria
Archduke Franz Karl Joseph of Austria (17 December 1802 – 8 March 1878) was a member of the House of Habsburg-Lorraine.He was the father of two emperors:Franz Joseph I of Austria and Maximilian I of Mexico.Through his third son Karl Ludwig, he was the grandfather of Archduke Franz Ferdinand of Austria – whose assassination sparked the hostilities that led to the outbreak of World War I – and the great-grandfather of the last Habsburg emperor Karl I.

Answer: Archduke Karl Salvator of Austria