In the 1930s, 70% of americans who were polled reported that the ideal number of children to have was in the 1990s, americans who were polled reported that the ideal number of children to have is _

The answer to the first unknown is "3 or more" while in the second unknown is "no more than two". Hence, we have the complete sentence as in the year 1930's of Americans who were polled reported that the ideal number of children was 3 or more. While in the year 1990's, Americans who were polled reported that the ideal number of children to have is no more than two.

Ithink it’s c , good luck on whatever : )