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

Shrubery
Senescent
Slaughter
Sneer

The correct answer is C. Slaughter.

Slaughter is a verb meaning to kill someone or something in a violent way. The other words are all spelled correctly.

Shrubery is a noun meaning a group of shrubs. Senescent is an adjective meaning growing old or becoming weak. Sneer is a verb meaning to show contempt or dislike by a facial expression or gesture.