A book that lists words in alphabetical order. It gives the definition(s), pronunciation, and a sample sentence for each word. (dictionary)
a. To entertain b. To inform c. To persuade

I believe that the answer is b. To inform

Hope this helps.

if the use/purpose is what youre looking for than you would think about "why di the author make this novel possible. the dictionarys use and purpose is to inform people of correct spelling and how to use it correctly

Explanation:

the servant does not kill the child oedipus as he was ordered to do because "he pitied the child" based on the oedipus rex story. the servant was ordered to kill the child because of the prophecy that predicted king laius' death. the king already had attempted to hurt oedipus by piercing oedipus's ankle. however, the servant did not finish the job and he rather saved the baby oedipus.

explanation:

3 is blunder, i’m not sure about the last one but the first two look correct