Topic: Sequence of Tense,

Best Answer Explained in Below-:

The correct answer is 'C) was cooking' because of the use of the past continuous tense, which is appropriate in this context. The sentence structure suggests that there are two actions happening at different times: the action of cooking and the action of the uncle arriving.

The phrase "while I" indicates that the cooking was an ongoing action when the uncle arrived. The past continuous tense, formed by "was" plus the present participle "cooking," is used to describe actions that were in progress at a specific time in the past.

Option A, "would cook," implies a future intention or habit in the past and does not fit with the context of the uncle's arrival. Option B, "had cooked," implies that the cooking was completed before the uncle's arrival, which does not align with the continuous nature of the situation being described. Lastly, option D, "cook," lacks the necessary tense and does not convey that the action was ongoing at the time of the uncle's arrival. Therefore, "was cooking" effectively captures the simultaneous nature of these two events.