Explanation:

Let’s break it down:

- Section 13 of the Specific Relief Act deals with cases when a person with only an "imperfect title" (not the full, absolute title) agrees to sell a property and later gets full title—they can be compelled to perform the contract.

- The section doesn’t apply if the vendor never had any title at all. It only kicks in when the seller starts with an imperfect title and then acquires full ownership later.

- Now, the options:

- Option 1: in which vendor has no title or has an imperfect title

- Not quite right—if the vendor has “no title,” Section 13 doesn’t apply. It’s about imperfect title that gets perfected.

- Option 2: in which vendor has title

- Doesn’t fit—Section 13 talks about people fixing their lack of title, not those who already have it.

- Option 3: in which vendor has imperfect title

- Here’s the thing: this matches the condition for Section 13 to apply—vendor starts with an imperfect title and later gets full title.

- Option 4: none of the above

- Not right; we do have a match above.

Option 1 is not fully correct because Section 13 doesn’t apply where there’s absolutely no title. It only applies where there’s an imperfect (but existing) title.

The right answer: Option 3: in which vendor has imperfect title. That’s who Section 13 covers. If there’s no title at all, that’s outside its reach.