Antonyms

In this sentence we would be selecting the word which is opposite to "acquitted" from the given options.
Acquit means to decide that someone is not guilty of a crime. Thus, the opposite would be to blame someone or charge someone guilty of a crime.
If we look into the options:
Entrusted means to give someone the responsibility of doing something
Convicted means to prove someone guilty of a crime. It is the correct option.
Burdened means heavily laden or encumbered or someone who has been given a lot of lead. 
Freed means not held physically.

Opposite word of dutiful is remiss.

ZENITH : highest point.
Acme : zenith.
Top : the highest or uppermost point.
Nadir : the lowest or most unsuccessful point in a situation.
Pinnacle : the most successful point.

Antonym of ZENITH is Nadir.

Indiscreet : Imprudent, unwise.
Reliable : Dependable.
Honest : Truthful, sincere.
Prudent : Wise, judicious.
Stupid : Unintelligent, ignorant.

Antonym of Indiscreet is Prudent.

The antonym of Graceful is Awkward.

The antonym of FRUGAL is EXTRAVAGANT.

You think you will persuade him to live a comfortable life? Impossible! A Spartan way of life is sacrosanct for him. If something is sacrosanct, it is too holy or important to be allowed any harm. The opposite of holy is unholy.

Malicious means evil and Kind means gracious.
So, Kind is the antonym of Malicious