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.

Officials say more than 10 million people take a dip at the confluence of the rivers Ganga and Yamuna in auspicious days for Kumbh Mela.

A

No improvement

B

in auspicious days during Kumbh Mela.

C

on auspicious days during Kumbh Mela.

D

on auspicious days for Kumbh Mela