**Answer:**

The correct answer is option A) Simple past.

**Explanation:**

The simple past tense is used to describe an action that happened in the past and is now finished. It is also used to talk about a specific time in the past.

Here are the key points to understand the use of the simple past tense:

1. **Completed actions:** The simple past tense is used to talk about actions that were completed in the past. For example:
- I went to the store yesterday.
- She finished her homework last night.

2. **Specific time:** The simple past tense is often used to indicate a specific time when the action happened. For example:
- We visited our grandparents last summer.
- They arrived at the party at 8 p.m.

3. **Regular or habitual actions:** The simple past tense can also be used to talk about regular or habitual actions in the past. For example:
- She always played tennis on Saturdays.
- We used to live in the city.

4. **Irregular verbs:** It is important to note that there are some irregular verbs in English that have different forms in the simple past tense. For example:
- I saw a movie last night. (past tense of "see")
- He ate dinner an hour ago. (past tense of "eat")

In contrast, the present perfect tense (option B) is used to describe actions that happened in the past but have a connection to the present. It is formed by using the auxiliary verb "have" or "has" and the past participle of the verb.

The simple present tense (option C) is used to talk about general truths, habits, or actions that are happening now.

The past perfect tense (option D) is used to talk about an action that happened before another past action. It is formed by using the auxiliary verb "had" and the past participle of the verb.

Therefore, the correct answer is option A) Simple past, as it specifically describes an action that happened in the past and is now finished.