In the following question, some part of the sentence may have errors. Find out which part of the sentence has an error and select the appropriate option. If a sentence is free from error, select 'No Error'.

I had not completed my English homework (a)/ so I thought I was done with when the (b)/ teacher asked me to hand it in. (c)/ No Error (d)

A

I had not completed my English homework

B

so I thought I was done with when the

C

teacher asked me to hand it in

D

No Error