Most often, it is deciphered through A) context clues. Some people, however, choose to decipher them through B) pronoun references. Just to be on the safe side, I'd choose A) context clues because most often, the words that are being deciphered are they themselves the pronoun.
B.) is the answer I think you're looking for.
A.) Text does not have only one meaning.
C.) Text is not a new word.
Hope this helps! (:
