The Correct answer is A.

Explanation

The sentence indicates that Allison had “glanced at a summary” but had not done something concerning the details of the law. If Allison had taken only a quick look at a summary of the legislation, she certainly would not have “examined,” or looked closely at, the details of the law. As a result, her knowledge of the legislation would be “superficial,” or shallow, rather than deep and thorough.