choosing a right modal verb
For example, somebody offers you something, but you are not sure if you are interested because you need to know more details. Which of the following sentences would be better to answer with in this situation:
1. I can be interested in it.
2. I could be interested in it.
3. I may be interested in it.
4. I might be interested in it.
I think I would use the 4th variant, but I am not sure if it's the best. I am asking you for advice