That the plan is both inhuman and preposterous needs no further proof.

Answer: Option C

heartless : displaying a complete lack of feeling or consideration.
impractical : not adapted for use or action; not sensible or realistic.
absurd : wildly unreasonable, illogical, or inappropriate.
abnormal : deviating from what is normal or usual, typically in a way that is undesirable or worrying.
preposterous : contrary to reason or common sense; utterly absurd or ridiculous.


Synonym of preposterous is absurd