An integer x is chosen so that 3x+1 is an even integer. Which of the following must be an odd integer?

**Answer Choices**

A. x+3

B. x-3

C. 2x

D. 7x+4

E. 5x+3

An integer x is chosen so that 3x+1 is an even integer. Which of the following must be an odd integer?

**Answer Choices**

A. x+3

B. x-3

C. 2x

D. 7x+4

E. 5x+3