Why was cotton called a cash crop? O A. It was heavily taxed by the government.
O B. It cost a lot to produce.
O C. It allowed for the purchase of slaves.
O D. It brought in a lot of money

The answer to the question above is the Columbia.
The space shuttle program began when the Columbia flew on April 12, 1981. It was the first fully functional orbiter, which was built in Palmdale, California. It was delivered in Kennedy Space Center on March 25 1979. The launching of the space shuttle marked the 20th anniversary of Yuri Gagarin's space flight, which happened on April 12, 1961.