Which of the following shows the effect of natural forces on the activities of ancient civilizations? A.
They built high walls around their cities to protect them from invaders.
B.
They constructed road systems to allow trade with other countries.
C.
They constructed large religious monuments to honor their gods.
D.
They built seawalls around their harbors to protect them from large waves.

the hollywood film industry of 1950 was threatened on several different fronts. television broadcasting was rapidly becoming the dominant entertainment medium in the united states. the paramount anti-trust consent decree requiring separate ownership for production companies and theater chains had gone into effect on 1 january 1950. large numbers of young men and women were marrying, having children, and moving to the suburbs, which affected the viability of downtown first-run movie theaters. foreign revenues were endangered by protectionist tactics including quota systems, high taxes, and blocked funds. finally, the morality and patriotism of hollywood films and filmmakers were under attack from government, religious, and citizens' groups.

explanation:

i need this answer                                                                 .