The correct answer is: A. Absess

An abscess is a localized collection of pus, typically caused by a bacterial infection. The word "abscess" is spelled correctly.

The other options are spelled correctly:

  • Accessory: a thing that is added to something else in order to make it more complete or useful.
  • Abrasive: causing physical or mental wear and tear.
  • Abstinence: the practice of refraining from sexual activity, alcohol, or other indulgences.