David is giving a keynote speech at a conference and notices that there are some people in the back of the audience who are talking while he presents. What type(s) of interference is David experiencing, and how should he proceed?
a. Internal; he should take some deep breaths and a drink of water before proceeding.
b. External; he should ask the people in the audience why they are talking during his sheech.
c. Both internal and external; he should ignore the people talking and continue.
d. External; he should check to see whether he can increase