Answer:
b. can help you learn to overcome apprehension
Step-by-step explanation:
Impromptu speech is when you give a speach no matter what is it aout but with no prior preparation to do so, if you do an impromptu speech and you realize that nothing happend, the world didn´t end, you can overcome apprehension over other things, that not all the time you have to be prepared and stress out about everything that happens so it goes well.