Benjamin Tallmadge made a significant contribution to the American Revolution primarily through his role in intelligence and reconnaissance. He was the head of the Culper Spy Ring, which was instrumental in gathering critical information about British troop movements and plans in New York City and surrounding areas.
From your options, the most accurate response would be:
He collected information from the British in New York City.
Tallmadge's efforts in organizing and managing this spy network greatly contributed to the American war effort.