Answer: The answer is :
(d)-Washington put cannons on hills above the city.
Explanation:
In November, Henry Knox suggested to George Washington that the continental army drag 59 cannons, captured at Fort Ticonderoga the previous spring, over 300 miles to Boston to bolster its defenses. This action forced them to withdraw.
The British blasted the American guns in Cambridge throughout the night, only to discover the many cannons pointed at them from Dorchester Heights on the following morning. The British Commander General William Howe remarked, "My God, these fellows have done more work in one night than I could make my army do in three months."