The correct answer is C. She finished work.
The question is about Sharon's activity yesterday, which is a past event. Therefore, we should use the simple past tense to report her activity. The simple past tense is used to talk about events that happened in the past and are now finished.
The other options are incorrect because they do not use the simple past tense. Option A, She will finish work, is in the future tense. Option B, She has finished work, is in the present perfect tense. Option D, She is finishing work, is in the present continuous tense.
Here is a summary of the simple past tense:
- Form: Subject + verb + (-ed)
- Use: To talk about events that happened in the past and are now finished.
- Examples:
- I went to the store yesterday.
- She ate dinner at 7 o'clock.
- We played basketball last weekend.