Correct option is C
In the sentence "The murder was too abominable to described," there is a grammatical mistake in part C regarding the infinitive structure.
• The correct structure after "too" followed by an adjective is "to be" plus the past participle when forming passive voice infinitives.
• Therefore, "to described" should be corrected to "to be described" to correctly form the passive infinitive, expressing that the act of describing the murder is too dreadful to undertake.
• This follows the grammatical rule that "too + adjective + to + verb" needs to be complemented with an appropriate verb form, which is the infinitive "be" for passive constructions.