Which of the following choices is the common difference between the terms of this arithmetic sequence?
3x + 7y, 8x + 4y, 13x + y, 18x - 2y, 23x - 5y, ...
A-5x - 3y
B3x + 7y
C5x - 3y
D5x + 3y
E3x - 7y
3x + 7y, 8x + 4y, 13x + y, 18x - 2y, 23x - 5y, ...
A-5x - 3y
B3x + 7y
C5x - 3y
D5x + 3y
E3x - 7y