This political cartoon was published in 1980.

A cartoon shows Leonid Brezhnev, wielding a hammer, attacking a man in a turban and robe, with the words "muslim rebels" on it. Brezhnev is striding over the U S S R border into Afghanistan.

The main message of the cartoon is that

A) the two sides are engaged in a friendly duel.
B) Muslim rebels have invaded the Soviet Union.
C) Muslim rebels are resisting the invading Soviet forces.
D) the two sides are involved in a border dispute.