The correct answer is A. abandon.
To banish someone is to force them to leave a place, usually for a long time. To abandon someone is to leave them, usually without warning or explanation.
B. harbour means to provide shelter or protection for someone or something. This is the opposite of banishing someone, as it involves welcoming them in rather than forcing them out.
C. intrude means to enter a place or situation without being invited or welcome. This is also the opposite of banishing someone, as it
involves entering a place or situation without permission.D. drop means to let something fall or fall from your hand. This is not the opposite of banishing someone, as it does not involve removing someone from a place.