We did not expect such a judicious remark from him.

Answer: Option D

Legal : relating to the law.
Stupid : having or showing a great lack of intelligence or common sense.
Rational : based on or in accordance with reason or logic.
Sagacious : having or showing keen mental discernment and good judgement; wise or shrewd.
Judicious : having, showing, or done with good judgement or sense.

Synonym of Judicious is Sagacious