Which Statement About Insect Muscles Is True

Which statement about insect muscles is true?

A) Unlike insect flight muscles, vertebrate striated muscles are described as asynchronous, because the cycling of the contractile mechanism is unlinked to firing of motor neurons.
B) The incredibly fast wingbeat frequencies produced by insect fight muscles result from the equally fast firing of action potentials in insect flight motor neurons.
C) Contraction of a fiber in an insect flight muscle does not involve calcium ions.
D) Once a fiber in an insect flight muscle is stimulated, the cycle of contraction and relaxation proceeds at its own specific frequency, provided that calcium is available for binding to troponin.
E) Contraction of an insect flight muscle occurs in the absence of troponin.