Read the excerpt from Brave New World.

Suddenly it was as though the whole air had come alive and were pulsing, pulsing with the indefatigable movement of blood. Up there, in Malpais, the drums were being beaten. Their feet fell in with the rhythm of that mysterious heart; they quickened the pace. Their path led them to the foot of the precipice. The sides of the great mesa ship towered over them, three hundred feet to the gunwale.

Which responses accurately explain how a student could determine the meaning of the word indefatigable?

a. The student could make a connection to the word fatigue and infer that indefatigable relates to energy levels.
b. The student could note the prefix in-, which means "not."
c. The student could use the context clue "pulsing, pulsing," in which repetition implies unceasing action