The correct answer is: A. Defendant

The word "defendant" is a noun that refers to the person or entity that is being sued in a court of law. It is derived from the Latin word "defendere," which means "to protect." The word "defendant" is first attested in English in the 14th century.

The word "defendent" is a misspelling of the word "defendant." The word "defendent" is not a recognized word in the English language. It is likely that the word "defendent" was created by mistake, or by someone who was not familiar with the correct spelling of the word "defendant."

The word "defendent" should not be used in formal writing or speech. The correct word to use is "defendant."