A person walks \(1 \mathrm{~km}\), turns around, and runs back to where he started. Compare the energy used and the power during the two segments.

A. The energy used and the power are the same for both.

B. The energy used while walking is greater, the power while running is greater.

C. The energy used while running is greater, the power while running is greater.

D. The energy used is the same for both segments, the power while running is greater.