It has no impact on the balance of payments, trade balance itself is just imports vs. exports.
You agree income increases with a fiscal expansion right? If income increases imports must increase, exports are simply a function of real exchange rate, so they remain unchanged.
So trade balance must deteriorate.
That's what I thought atleast, actually option d in this question pushed me to mark that as the answer, what actually happens is just the opposite of what they have described in that option (there would be an increase in import without affecting exports).