Question

This molecule is:

A) insulin
B) hemoglobin
C) glucose
D) a phospholipid
E) ATP

Answer 1

From my knowledge that molecule is ATP.

It's helpful if you know what the acronym ATP means.
Adenine Triphosphate

In this picture you can see Adenine, and 3 Phosphate groups. :)
That's a dead giveaway!

(Also Ribose is in ATP. Although you just need to remember the name of the acronym to identify it)