Don’t chew panmasala, . . . . . ?

Answer: Option A

Imperatives are verb forms used to give orders, instructions, requests or warnings

When we add a question tag after an imperative, English grammar normally uses → will you?

Even if the imperative is negative (beginning with DON’T) → the tag is still will you?

Examples
Don’t make noise, will you?
Don’t open the door, will you?

So → in this sentence
Don’t chew panmasala, will you?

Why not “should you?”
“should you?” is used in independent questions asking for opinion / advice
Example → Should you be eating so much sugar?

But after an imperative, English grammar rule is fixed → the tag is will you?

Therefore the correct option = A — will you