Which one is correct?

A:

- Did you eat that whole bag of chips while you were working on your report?

B:

- Yes, and it wasn't until I was done with it that I realized I had eaten them all

A:

-..........

B:

- I guess so. It was such a boring report. I wasn't even aware that I was munching and working at the same time.

a) I hope you aren't one of those people who turn to food whenever they do something boring.

b) Wasn't it hard for you to focus on the work while you were eating?

c) I suppose you have completed the report now.

d) You must have been really stressed then.

My answer is C. Is it correct?