A shared threat:

A) decreases perception of a common identity.
B) increases perception of a common identity.
C) has no influence on perception of a common identity.
D) decreases perceptions of a common bond.

When a group or community faces a shared threat, it often increases their perception of a common identity. This shared threat may bring people together and unite them around a common cause or goal, leading to the formation of stronger bonds and greater solidarity within the group. The sense of belonging and shared purpose may help to overcome differences and disagreements that previously existed, and foster a greater sense of community among the members of the group. Therefore, option B is the best choice.