1. a. Absurd
Logical refers to something or someone capable of clear and sound reasoning. "Absurd" is the perfect antonym for "logical" because it refers to something or someone wildly unreasonable, illogical or inconsistent with the plain dictates of common sense or inappropriate and ridiculous.
2. C: it contains repeating consonant sounds
Alliteration is a literary device that uses repetition of consonants at the beginning of two or more words next to each other, and sometimes separated by short words like "and," "a," "of," and "to."