Addition of more myoglobin to a muscle fiber would have the largest effect on fast oxidative fibers only fast oxidative and slow oxidative fibers fast glycolytic fibers only fast glycolytic and fast oxidative fibers

The correct answer is "fast oxidative and slow oxidative fibers"

Myoglobin is the counterpart of hemoglobin in muscles. It is a single subunit protein that has a high oxygen affinity that "stores" oxygen until the muscles are in oxygen deficit wherein the myoglobin "let's go" of the stored oxygen. Both fast oxidative and slow oxidative fibers benefit from myoglobin as these fibers use more oxygen than other fibers.

He should put sand around the spill in order to contain it so that it won't spread