In Julius Caesar, by Shakespeare, Marcus Brutus agrees to join in the plan to kill Caesar under what condition?A) That they kill Mark Antony B)...

In Shakespeare's Julius Caesar,
Cassius approaches Brutus to see how Brutus feels about Caesar. Brutus loves Rome, but
he fears Julius Caesar, especially when he learns that Antony has tried several times to
crown Caesar as one would a king, though Caesar has
refused.

Cassius does not love Rome,
but he does hate Caesar. He wants him dead because Caesar has power
that Cassius feels Caesar lords over him. Cassius recalls the time, to Brutus, when
Caesar and Cassius were swimming across rough water and Caesar started to sink, and he
called for Cassius' help. Cassius saved Caesar, but Cassius says Caesar has forgotten
what Cassius did for him, and Cassius must bow like every other lowly person Caesar
passes. So Cassius wants Caesar dead, and he recruits other men as
well.

Brutus is wrong to kill Caesar, but his motivation is
honorable: all for the good of Rome. So when one of Cassius' co-conspirators suggests
that they kill Antony as well, Brutus disagrees. He feels Caesar is a threat, but not
Antony. He urges everyone to be as "civilized" in this murder as possible (something of
an awkward sentiment in the face of murder).

So "C" is the
answer you want.