While a Conversion Process Defined by Manufacture (Or Production) Yields

While a conversion process defined by manufacture (or production) yields a tangible output called the product, a conversion process defined by service yields an intangible output.Which forms can this intangible output take?

A) Activity, Action, Performance, or Effort
B) Activity, Effort, Performance, or Recital
C) INCORRECT: Activity, Action, Recital, or Effort
D) Action, Recital, Performance, or Effort