Why did the nightly knocking at the temple finally stop in “old man of the temple” by r. k. narayan?

There exists the same question that has the following choices.

A. The narrator helped the old man find his way to his wife.
B. They drove the old man out of town, so he wouldn’t bother the temple anymore.
C. The taxi driver had run over and killed the old man; he was no longer able to knock on the doors each night.
D. The narrator took the old man into his home, so he had a place to stay.

The correct answer is letter C. The taxi driver had run over and killed the old man; he was no longer able to knock on the doors each night.