Question

Osteoporosis is more prevalent among women than men because women generally
have more bones in their bodies than men have.
take in more calcium than men take in.
have lower bone mass than men have.
exercise more than men do.

Answer 1

have lower bone mass than men have.

Women generally reach a lower peak bone mass than men and, after menopause, loss of estrogen accelerates bone resorption. These factors (plus smaller bone size and longer average lifespan) make osteoporosis more common in women.