Skeletal muscle myosin from lizard shows maximal ATPase activity over a wide range of temperatures. This is due to the fact that

A) in poikilothermic organisms, muscles must function over a broad range of temperatures, and myosin ATPase activity is essential for muscle function.
B) at lower temperatures, myosin can uncouple from actin, and the ATPase activity can be used to generate heat without locomotion, allowing the lizard to warm up metabolically.
C) both of these.
D) neither of these.