Question

alternative has the same or almost the same meaning as: unconventional unacceptable unconditional unavoidable

Explanation:

"Alternative" often implies something different from the usual or conventional. "Unconventional" means not conforming to what is traditional or customary, which is similar in meaning. "Unacceptable" means not satisfactory or allowable. "Unconditional" means not subject to any conditions. "Unavoidable" means unable to be avoided or prevented.

Answer:

A. unconventional