Answer:
B- A statement against interest
Step-by-step explanation:
The member spoke to the guard about their plans including the locations of the other bombs and the names of the other group members. This was done against his interest and against the interest of the group he belonged to as it leaves him in a less advantageous position than if he had not disclosed the details. This is what a statement of interest entails.
A statement against interest is not the line of response first normally expected from a person in the position of declarant as the person would not have made such statement unless it was believed to be the truth by the declarant.
In this case, the statement made by the member, leaves him as well as his relations in the case of his death at a disadvantaged position and would not have been spoken of if the member did not believe it strongly to be the truth.