Correct. This is the most important reason. 1 point to you.

A fellow I know was moving his boat south last fall. He had
had a hard grounding last season, and during the passage
south the keel started working back and forth. The electric
bilge pump kept up with it, but when the power failed
during the last two days of the trip, it required 100 pumps
an hour to keep it dry.

If they had hand pumped the bilge they would have saved
their batteries, and been aware of the problem early on.

"thunder" wrote
Bart Senior wrote:

Why is it a good idea to hand pump your bilge every day when sailing on
the ocean? [1 pt]

It's one way to detect any changes in the amount of water in the bilge.