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.
Which of the statements given above is/are correct?

A. 1, 2 and 3

B. 1, 2 and 4

C. 1, 3 and 4

D. 1 and 3

Answer: Option B