Which of the following option positions will benefit a trader if the price of the underlying shares increases?

a) Long position in a call.

b) Short position in a call.

c) Long position in a put

d) Short position in a put.

I know the option a will definitely benefit a trade, since the St is greater than the exercise price.

however, for the option d, when the share price is higher, the put seller will from a negative profit situation to a profit situation which earns P(premium) when the share price increase.

So does the answer for this question are 2?