A person riding in a 100-mile bicycle race relies on which energy system to fuel her long ride
A. aerobic respiration
B. anaerobic respiration
C. ATP stored in muscle cells

I think its B

Explanation:

Hope this helped :)

aerobic respiration

Explanation:

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note: for words found inappropriate, i spelled them out in the phonetic alphabet in parenthesis, so take the first letter of each word to get the word i was trying to spell

answer; i believe its the red blood cells; plz check first good luck