The diagrams show the concentrations of three substances, PPP, QQQ, and RRR, in the blood before and after a high-carbohydrate meal. One of the substances is glucose and the other two are pancreatic hormones.

Which of the following rows correctly identifies substances PPP, QQQ, and RRR?
Substance P: glucose, Substance Q: insulin, Substance R: glucagon
Substance P: glucagon, Substance Q: glucose, Substance R: insulin
Substance P: insulin, Substance Q: glucagon, Substance R: glucose
Substance P: glucagon, Substance Q: insulin, Substance R: glucose