Answer:
Option C is the correct answer.
Explanation:
A tarot card reader gets paid $90 for each deck he reads.
Payment per each deck he reads = 90$
His goal is to earn $2340 reading tarot cards this month
Total earning needed = 2340 $

If he has already read 3 decks this month, how many more decks must he read in order to reach his goal.
Number of decks he must read = 26 - 3 = 23
Option C is the correct answer.