I believe the answer would be Oceanography.
The right answer for the question that is being asked and shown above is that: "D. they were trained to serve the sultan as cavalier soldiers." All of the following are true statement about the powerful African slaves known as the Mamluks EXCEPT D. they were trained to serve the sultan as cavalier soldiers.
a. the absolute freedom of the individual
was a decision by the Supreme Court of the United States that invalidated regulations of the poultry industry according to the non-delegation doctrine and as an invalid use of Congress' power under the commerce clause.
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source
https://en.wikipedia.org/wiki/A.L.A._Schechter_Poultry_Corp._v._United_States
Military forces, berlin wall, iron curtain
