Which statement correctly explains whether more ATP is found in muscle cells or bone cells?
A. More ATP is found in muscle cells because they use energy less efficiently than bone cells.
B. More ATP is found in bone cells because they grow more and need energy from ATP.
C. More ATP is found in bone cells because they need large amounts of energy to produce marrow.
D. More ATP is found in muscle cells because they need large amounts of energy to power motion.