Which had the greatest effect on growth of cities and the expansion of cities to suburbs

B. transportation innovations.

Explanation:

The transportation innovations increase the mobility of the resources needed for the growth of cities. Industrial cites are always chosen in the proximity of natural resources to have easy access to the raw material. With the development of the transportation facilities now cities can be extended to the suburbs and still have better communication.

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: