We did not expect such a judicious remark from him.

The correct answer is: D. sagacious

Sage is a synonym for judicious, which means showing good judgment or common sense. Shrewd means clever and cunning, while rational means based on or in accordance with reason. Legal means permitted by law.

In the context of the sentence, “We did not expect such a judicious remark from him,” the speaker is surprised that the person made a remark that was wise and well-considered. The other options do not fit the context of the sentence as well.