The correct answer is B) a Pequot Fort at Mystic,
The following was the site of the most serious conflict of the Pequot War: a Pequot Fort at Mystic.
On May 26, 1637, Captain John Manson and the Connecticut colonies set fire to the Pequot Fort that was located near the Mystic River. The incident was part of the Pequot War (1636-1638), a conflict between the Pequot American Indians and the members of the Massachusetts Bay, Connecticut, and Saybrook. In that Pequot Fort attack, the Pequot tribe was practically eliminated.