If y = 2x + 1, what is the arithmetic mean of 2x, 2x, y, and 3y, in terms of x?

- 2x
- 2x + 1
- 3 x + 1
- None of the above

- There is no pattern.
- The set starts with 2 and ends in 17.
- The set starts with 2 and jumps 3 each time.
- The set starts with 2 and jumps 2 each time.