Why do octavius and mark antony want to engage in a battle with brutus and cassius?
to avenge caesar’s death
to recruit new soldiers to their army
to become friends with the conspirators
to gain control over the land

The answer is to avenge Caesar’s death.  They formed a third Triumvirate with Lepidus and massed their armies to defeat the conspirators who caused Caesar’s death.  After dealing with conspirators in Rome they fought the armies of Brutus and Cassius at the Battle of Philippi were Brutus and Cassius took their lives and the Third Triumvirate emerged victorious.

your answer is c) experiments with water vapor showed that elements combine in specific proportions.

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