In her firm, Marie-Clairewrites speeches for spokespeople. When writing, she always tries to keep ...

In her firm, Marie-Clairewrites speeches for spokespeople. When writing, she always tries to keep each speech to only one or two limited points. Marie-Claire employs this strategy to ensure audiences remember the points after the speech is over.
 
  What other method can Marie-Claire adapt to make her speeches memorable and effective?
  a. Provide definite, specific ideas in clear language
 b. Double-check the reliability of information
 c. Use contractions for a conversational tone
 d. Use terms and expressions that are familiar