Answer:
'Had Bought'
Explanation:
The infinitive 'to buy' turns into 'had bought' in past perfect. The PAST TENSE is simply 'bought', but the PAST PERFECT tense is 'had bought'.
I think the answer is :<span>It serves as one of the main conflicts because it leads Della to sell her hair.
BTW is there options</span>
The answer is B since the conclusion is based on the premises.