Tim's phone service charges $22.42 plus an additional $0.18 for each text message sent per month. If Tim's phone bill was $26.92, which equation could be used to find how many text messages, x, Tim sent last month?
A. $22.42x + $0.18 = $26.92
B. $0.18x - $22.42 = $26.92
C. $0.18x + $22.42 = $26.92
D. $22.42x - $0.18 = $26.92