Literacy is the ability to clearly state thoughts, opinions, and facts through writing as well as being able to identify and differentiate different thoughts, opinions, and facts through any given piece of work. This applies to anything involving words and/or social interaction/social opposition (social conflict.)
The answer is the third choice or choice C. Persuade means to CONVINCE someone to try to do something or try something. In this case the speech is PERSUADING the audience to become vegetarians.