The following sentence has been split into four segments. Identify the segment that contains a grammatical error.

"Do you want to join us for lunch?" / "I'm sorry / my physics class will start at 1 p.m. /and doesn't finish till 3 p.m."

A

my physics class will start at 1 p.m.

B

I'm sorry

C

and doesn't finish till 3 p.m.

D

Do you want to join us for lunch?