Which of These Statements Correctly Describes Fast Glycolytic (Type IIb)

Multiple Choice

Which of these statements correctly describes fast glycolytic (type IIb) fibres?

A) They contain an abundance of mitochondria.
B) The muscle fibre diameter is small.
C) They are most abundant in muscles specialized for maintaining low-intensity contractions for long periods of time without fatigue.
D) They can be converted into fast oxidative fibres by regular endurance activities.