Introduced in the 1930s, the first handheld cameras were A. too expensive to use. B. used primarily by families for home movies. C. used during World War II for newsreels. D. too heavy to use.

D) too heavy to use

Explanation:

After doing some research on the topic shown on this task, it is fair to conclude that, introduced in the 1930s, the first handheld cameras were too heavy to use, but, however, these ones were the equipment at the time, so the film-makers and journalists had to deal with the issue.

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )