Sentence Correction - Verbal and Reasoning

Directions to SolveWhich of phrases given below each sentence should replace the phrase printed inboldtype to make the grammatically correct? If the sentence is correct as it is, mark 'E' as the answer.
Q1:

The train will leave at 8.30 pm, we have been ready by 7.30pm so that, we can reach the station in time.

A were

B must be

C are

D should have

E No correction required

ANS:B - must be

No answer description is available.