Demetrius talks to himself before the football game to get himself pumped up. He is engaged in

An oral summary of a written brief delivered to an audience by a group member

What will be an ideal response?

How are receivers able to distinguish a Duchenne smile from a non-Duchenne smile? The Duchenne smile __________

a. does not involve eye muscles b. lasts longer c. has a smoother quality d. only experienced communicators can distinguish the two