i believe the answer is 1…
My line of thinking might be weird tho. But there are 3 groups. But regardless, you should always know that whenever S is involved, there’s a sigma bond, and it had to bond with one of the Ps. The other P will be the pi bond.
I dont believe thats enough information to answer the question. was there a lewis structure picture also? i know if there is a double bond that means theres one pi bond. triple bond 2 pi bonds etc etc.