A Single Bout of Exercise Increases VEGF MRNA Less in a Trained

A single bout of exercise increases VEGF mRNA less in a trained muscle than in an untrained muscle. The most plausible explanation for this difference is that trained muscle has more

A) capillaries, so intracellular oxygen delivery remains higher during exercise.
B) mitochondria, so it can generate much more force than untrained muscle.
C) capillaries, so intracellular oxygen delivery remains lower during exercise.
D) mitochondria, so it does not need more capillaries.