The Sentence "Senator Samson Denied Having Sex with Her Intern

The sentence "Senator Samson denied having sex with her intern in front of a full Congress yesterday" is ambiguous because it is

A) equivocal—there's a word that has more than one possible meaning.
B) amphibolous—the sentence structure is faulty.
C) negative—it says what she did not do rather than what she did.
D) an attack on the Senator rather than her argument.