Answer:

Introduction:
In this question, we have to identify the correct tense of the verb in the sentence. The sentence is in the past tense, so we have to use the past tense form of the verb.

Explanation:
The sentence is in the past tense, and we need to use the past tense form of the verb to make it grammatically correct. The three options given are:

a) Asks
b) Has asked
c) Asked

The correct answer is option 'C', which is "Asked".

Explanation of each option:

a) Asks: This is the present tense form of the verb 'ask'. Since the sentence is in the past tense, we cannot use the present tense form of the verb. Therefore, this option is incorrect.

b) Has asked: This is the present perfect tense form of the verb 'ask'. This tense is used to describe an action that started in the past and has continued up until the present. Since the sentence is in the past tense and refers to a specific time in the past, we cannot use this tense. Therefore, this option is also incorrect.

c) Asked: This is the simple past tense form of the verb 'ask'. This tense is used to describe an action that happened at a specific time in the past. Since the sentence is in the past tense and refers to a specific time in the past, we can use this tense to make the sentence grammatically correct. Therefore, this option is the correct answer.

Conclusion:
The correct answer to the question is option 'C', which is "Asked". We need to use the simple past tense form of the verb 'ask' to make the sentence grammatically correct.

C