This answer is D. entertainment.
In the mock-up of an airplane cabin, heated yellow bags were placed where people would normally sit in order to replicate the situation where the plane is full of people. The yellow bags were heated since human body temperature is generally at 37 degrees Celcius. This is to correctly construct an experimental model of the airplane cabin.
It requires the government to pay a fair price for the property taken from the owner
<span>Black codes were restrictive laws designed to limit the freedom of African Americans and ensure their availability as a cheap labor force after slavery was abolished during the Civil War. Though the Union victory had given some 4 million slaves their freedom, the question of freed blacks’ status in the postwar South was still very much unresolved. Under black codes, many states required blacks to sign yearly labor contracts; if they refused, they risked being arrested, fined and forced into unpaid labor. Outrage over black codes helped undermine support for President Andrew Johnson and the Republican Party.</span>
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