Explanation:

- Option 1: have been cut

- Correct Answer

- The error lies in the use of "have been cut." The correct phrase should be "has been cutting" because Sitab is a singular subject and it requires singular verb form.

- Option 2: Sitab, my gardener

- This segment is correctly identifying the subject and providing additional information about it.

- Option 3: the hedge

- This part is grammatically correct as it properly identifies the object of the action.

- Option 4: the whole morning

- This segment is proper as it correctly indicates the duration of the action.