The best option for clarity and grammatical correctness in this context is:
C. While I was baking
This option clearly indicates that you were the one baking the pie when the incident occurred.
While baking a pie, an oven mitt I had left in the oven caught fire and set off the smoke detector.
AWhile bakingBWhile attempting to bakeCWhile I was bakingDWhile it was baking
1 answer