The correct way to run two variables x and y in a single for loop simultaneously involves having both variables initialized, updated, and checked together in the loop's structure.

Explanation:

• Option (A) and Option (D) are incorrect because they represent two separate for loops. Each loop runs independently, so they do not execute simultaneously in the same loop structure.

• Option (B) is the correct one. It initializes both x and y together, sets their conditions (x < m and y < m), and updates both variables in each iteration (x++ and y+=3).

Correct Answer:

(B) for (x = 0, y = 0; x.