Slavery expanded with the growth of (a)public education (b)cotton plantations (c)freight shipment (d)northern industries

The correct answer is:

B. cotton plantations.

Explanation:

Cotton plantations required tough work, people had to plant, harvest and remove the seeds to produce cotton. When the industry of cotton expanded in the eighteenth century, it increased the amount of labor force needed on plantations, therefor, the amount of slaves needed to work on cotton plantations increased and slavery trade expanded.

Due to suspicion of communist activities.

Explanation:

During the Cold War, the authorities accounted for within the country with anyone associated in any way with communism. Thus, the action was taken in which about ten Hollywood directors and screenwriters were arrested. They were arrested on suspicion of supporting and propagating communist activities. Most were imprisoned, and some members of the group admitted that there were some communist activities in Hollywood.