When the Birth Rate Is Equal to Each Woman Producing

When the birth rate is equal to each woman producing exactly enough offspring to replace herself and her offspring's father, and the birth rate is sustained for a generation, then which of the following is correct?

A) 0 < r < 1
B) r = 0, and there is zero population growth.
C) r = 1
D) r > 1
E) Population size is at carrying capacity.