Find out whether there is any grammatical error in below sentence.
Since the attachment of airconditioned sleeping cars to all important trains, / travelling became very pleasant, / especially during the summer season.

A. Since the attachment of airconditioned sleeping cars to all important trains,

B. travelling became very pleasant,

C. especially during the summer season

D. No error

Answer: Option B

Solution(By Examveda Team)

travelling has become very pleasant