Does the sentence "The country is a member of the Organization for the Harmonization of Business Law in Africa (OHADA)." provide a valid answer to the question "How much land did the Congolese government agree to lease to South Africans in 2009?"

A: no

Does the sentence "Following a long period of military setbacks against European powers, the Ottoman Empire gradually declined into the late nineteenth century." provide a valid answer to the question "What led to the decline of the Ottoman empire?"

A: yes

Does the sentence "The pattern of an ideal isotropic antenna, which radiates equally in all directions, would look like a sphere." provide a valid answer to the question "What type of pictoral aid is often used to show this?"

A: no

Does the sentence "John's strategy was to isolate the rebel barons in London, protect his own supply lines to his key source of mercenaries in Flanders, prevent the French from landing in the south-east, and then win the war through slow attrition." provide a valid answer to the question "What was John's strategy?"

A:
yes