The fertility rate measures the average number of children parents want in a year.

The statement is false. The fertility rate doesn't measure the average number of children parents want in a year.

Explanation:

Fertility rate is an estimate of the average number of children a woman would have until the end of her reproductive period, keeping the rates observed on that date. In this sense, this indicator expresses the average reproductive condition of women in a given place, being a very important data for the analysis of demographic dynamics. According to data from the United Nations, the fertility rate is 2.52 children per woman. This result confirms a worldwide trend towards a reduction in the number of children.

i think the answer is   b.

the russian revolution of 1917 involved the collapse of an empire under tsar nicholas ii and the rise of marxian socialism under lenin and his bolsheviks.