Answer:

The correct answer is option 'A', which states that the given sentence is in the past perfect tense.

Explanation:

The past perfect tense is used to describe an action that happened before another action in the past. It is formed by using the past tense of the auxiliary verb 'have' (had) and the past participle of the main verb.

In the given sentence, the verb "have" is used in the past perfect tense form "haven't" (had not), indicating that the action of not changing much occurred before a certain point in the past.

Let's break down the sentence to understand it better:

"You haven't changed much."

- Subject: "You"
- Auxiliary verb: "have" (in the past perfect form "haven't")
- Main verb: "changed" (past participle)
- Adverb: "much"

The sentence implies that the person being addressed ("you") did not change much in the past. The action of not changing much is considered to have taken place before the time being referred to.

Example:

To further illustrate the use of the past perfect tense, let's consider a context:

Context: John hadn't seen his childhood friend for many years. When they finally met again, he remarked, "You haven't changed much."

In this example, John is expressing his surprise that his friend has not changed significantly over the years. The action of not changing much (the friend's appearance or personality) happened before the time of the conversation, which is why the past perfect tense is used.

Conclusion:

In conclusion, the given sentence "You haven't changed much" is in the past perfect tense. It indicates an action of not changing much that occurred before a certain point in the past.