Choose the word that is opposite in meaning to the given word.
Appellant

Let's explore the meaning of the marked word and the given word.
Appellant: someone who appeals for a legal or official decision to be changed. 
Example: The jury acquitted the appellants of the conspiracy as it was originally charged.
Defendant: a person in a law case who is accused of having done something illegal.
Example: The jury concluded from the evidence that the defendant was innocent. 
From above, the correct answer is option 1.