Final answer:
The direct object in the sentence is 'mother,' as it answers the question 'whom' did Kimi ask. Therefore, the correct answer is (c) Mother.
Step-by-step explanation:
To find the direct object in the sentence 'After the concert, Kimi asked her mother to come and pick her up,' we need to identify the verb and ask 'what?' or 'whom?' is receiving the action of that verb. The verb in this sentence is 'asked.' Kimi asked whom? The answer is 'her mother.' Therefore, 'mother' is the direct object of the sentence. The options for the direct object in the question are concert, Kimi, mother, and her. The correct answer is (c) Mother.