read the following passage to determine the meaning of the word vigorously

my sister and I left our dog Daisy outside in the rain. We made sure to vigorously towel her off before letting her on the new carpet.

Why do they towel the dog vigorously ?

A. they don't what to hurt her
B. they want toto do a thorough job
C. they are not sure how to do it
D. they think it a waste of time