The use of short, direct sentences with no fluff is known as  a. business style b. casual style c. creative style d. direct style  

The use of short, direct sentences with no fluff is known as business style, that is, the answer to your question would be A. In order to develop an effective business style, you should use shorter sentences, use simpler sentence structures, use the active voice, avoid nomilizing verbs and write from the point of view of the company.

a, overstatement is the answer