He has a superficial knowledge of the subject.

Answer: Option B

Superficial : not thorough, deep, or complete; cursory.
Wide : of great or more than average width.
Profound : (of a person or statement) having or showing great knowledge or insight.
Sufficient : enough; adequate.
Excessive : more than is necessary, normal, or desirable; immoderate.

Antonym of Superficial is Profound