Before and After 10 Weeks of Endurance Training, an Individual

Before and after 10 weeks of endurance training, an individual performs a submaximal exercise test at a constant work rate. Which of the following changes would most likely occur as a result of the endurance training?

A) A lower cardiac output.
B) An increase in oxygen consumption.
C) An increase in the blood flow to the exercising muscle.
D) Lower blood lactate levels.