The correct alternative would be letter C.
Increasing health problems among men wasn't one of the results of the baby boom.
The increasing number of kids, helped businesses that sold products for teenagers grow, so alternative A is a result of the baby boom.
When couples were having more kids, it made sense for women to leave their jobs and stay at home with the kids, so alternative B could be a result of the baby boom.
As families grew, they needed more space. Thus, suburbs became an interesting option. This was also a result of the baby boom.
As we've seen with the previous alternatives, that leaves us with alternative C as the correct one, since increasing health problems among men have nothing to do with the baby boom.
