His judicious handling of the matter saved the situation from going out of control.

Answer: Option C

Nervous : easily agitated or alarmed.
Helpful : giving or ready to give help.
Sensible : done or chosen in accordance with wisdom or prudence; likely to be of benefit.
Cautious : (of a person) careful to avoid potential problems or dangers.
Judicious : having, showing, or done with good judgement or sense.

Synonym of Judicious is Sensible