Final answer:
The reasons given for John Holbrook's enlistment in the militia are a sense of duty to protect the colony and a desire to gain recognition and status in the community.
Step-by-step explanation:
In "The Witch of Blackbird Pond," the reasons given for John Holbrook's enlistment in the militia are b) John Holbrook enlists out of a sense of duty to protect the colony and its people and c) John Holbrook enlists to gain recognition and status in the community.
In the novel, John Holbrook enlists in the militia because he believes it is his duty to protect his community. He wants to defend the colony from any potential threats and contribute to its safety. Additionally, he sees joining the militia as a way to gain respect and recognition, as it is a respectable position in the community.