The correct answer is B.
William Howe was a commander of the British army between 1775 and 1779. He arrived when Boston was under siege by the rebels to assist the chief commander General Gage. Before they could put into practice their plans against the siege, the rebels managed to control Breed's Hill, in the Charlestown area, which was a clear provocation for the British to start the hostilities.
Howe planned a frontal attack that was approved by Gage, thinking that the military unprepared colonials would retreat. He was completely wrong and actually this battle become one of the bloodiest in the American Revolutionary War.
The British were defeated, and the victory was specially valuable for the rebels as it gave them confidence to continue in the fight against the Empire, as they had already seen it was possible to beat the British King's forces.