which verb and preposition is correct?
That man is pinching his nose at bad smell
That man is plugging his nose from bad smell
That man is holding his nose against bad smell
That man is clamping his nose due to bad smell

Question

Answer

That man is holding his nose against a/the bad smell
That man is clamping his nose due to a/the bad smell

Both these are correct.  The other two are technically correct, I think, but you would never hear them.