Select the most appropriate option to substitute the underlined segment in the given sentence. If there is no need to substitute it, Select No improvement.
People arrive from all parts of the country and had walked miles to take a dip at the confluence of the Rivers Ganga
and Yamuna.

A

are walking miles to take a dip

B

walk for miles to take a dip

C

had walked miles taking a dip

D

N0 improvement