Refer to the Figure Shown

Refer to the figure shown.
Which statement regarding the data presented in the figure is true?

A) Blood circulation to muscle was significantly increased during the dives.
B) Oxygen supplies for the brain and myocardium remained low during the dives.
C) Muscles switch to anaerobic metabolism at some point during the dives.
D) Circulating blood oxygen continued to be made available from oxygen in muscle.