Here are the answers to your questions based on common knowledge regarding public speaking:
Question 1:
c. visual and auditory
Question 2:
d. source
Question 3:
d. receiver
Question 4:
b. someone coughing in the back row
Question 5:
c. context
Question 6:
d. Focus on the behaviors you can change rather than things you cannot.
Question 7:
a. both a trait and a state
Question 8:
b. a simultaneous process
Question 9:
b. channeling your nervous energy
Question 10:
c. Most people are apprehensive about giving a speech.
Question 11:
b. Human communication
Question 12:
d. context
Question 13:
d. specific purpose
Question 14:
d. Use them for emphasis.
Question 15:
d. easy to read at a glance
Question 16:
c. presentation aids
Question 17:
b. by choosing support material that appeals to your listeners' senses
Question 18:
d. supporting materials
Question 19:
d. after you have carefully organized the body of your talk
Question 20:
b. give your audience a reason to listen
Make sure to double-check these answers based on your course material or lecture notes for accuracy!