Which of the Following Resulted from Stalin's Use of Terror

Which of the following resulted from Stalin's use of terror tactics to assure fulfillment of production quotas in the 1930s?

A) Stalin received mass support, as his tactics were the same as those used by Lenin to inspire compliance with his New Economic Policy in the 1920s.
B) Uprisings among factory workers increased, and so many workers were imprisoned that the rate of production dropped some 20 percent by 1938.
C) Up to half a million skilled and semiskilled workers emigrated before Stalin effectively sealed the Russian borders in 1938.
D) Economic failure as workers were all too inexperienced with industry to meet quotas, as well as the murder of farmers, caused the grain harvest to drop dramatically.