Answer:
A dictionary helps the reader find synonyms and antonyms for unknown words.
A dictionary helps clarify the meaning of unknown words.
Step-by-step explanation:
A dictionary is a reference book which lists out words in alphabetical order, giving the meaning of the word, spelling, pronunciations and other relevant information about the word.
Therefore, the two functions of a dictionary according to the options given are A dictionary helps the reader find synonyms and antonyms for unknown words.
A dictionary helps clarify the meaning of unknown words.