Answer:
To best deal with her communication apprehension, she should visualize success.
Explanation:
A communication apprehension refers to the anxiety an individual might feel when a communication interaction will happen, wether it is real or imagined.
In this case, Siobahn is having negative and self-destructing thoughts regarding her speech which in turn might hurt the real speech. It is best for her to visualize success, to visualize that everything will turn out fine and that she will be successful regarding the speech.
This could help turn the outcome into a positive one.
