Answer:
B. De Gálvez led Spanish forces north, which aided colonists who defeated the British.
Step-by-step explanation:
B is correct answer because after Spain entered the war, Galvez led the troops to take control of the British fortress.
A is not correct as he didn't participate in this treaty.
C is not correct as he was too young back then and didn't participated in this war.
D. New Orleans was Spanish back at the time, so he didn't needed to fight to take it.