In the introduction of her informative speech on skin cancer prevention and treatment, Beth says, "I never thought I'd need to know much about skin cancer prevention and treatment. I ignored the public service announcements. I went to the tanning salon before Spring Break. And then last year, after a routine physical examination, I learned more than I ever wanted to know. I was diagnosed with skin cancer. I want to help you avoid having a personal experience with skin cancer." Beth's statement showed the importance of the information to her classmates. Her strategy should enhance what key to effective informative speaking?
a) Relevance
b) Credibility
c) Clarity
d) Engagement