Consider the following statements.
AIDS is transmitted
1. By sexual intercourse
2. By blood transfusion
3. By mosquitoes and other blood sucking insects
4. Across the placenta

A. 1, 2 and 3 are correct

B. 1, 2 and 4 are correct

C. 1, 3 and 4 are correct

D. 1 and 3 are correct

Answer: Option B