Find out that word, the spelling of which is wrong.

The correct answer is

B. Anasthetic. The correct spelling is anesthetic.

A. Anniversary is a noun that means the date on which an event took place

or is commemorated in a special way, typically every year on the same date as the original event.

C. Acknowledgement is a noun that means the act of recognizing and accepting the existence or truth of something.

D. Altogether is an adverb that means in total; all together.