If you're trying to get to sleep, you should not

The answer in my opinion should be not to drink caffeine 4 hours before bed.

the last statement is correct i.e.

when your heart is not pumping enough blood around your body because your heart is severely failing, you may need an artificial heart. an artificial heart is a mechanical device, about the size of an orange, that is connected to your heart or implanted in your chest to or replace a failing heart.

the answer is c, the development of reading and writing in young children