In most programming languages like JavaScript, C, and C++, a for loop is structured in the following way:

• Initialization (i = 0): The loop variable is initialized.
• Condition (i <= 5): The loop continues as long as this condition is true.
• Increment (i++): The loop variable is updated after each iteration.

The correct syntax is:

(D) for (i = 0; i <= 5; i++).

This will start the loop with i = 0, and it will run as long as i is less than or equal to 5, incrementing i after each iteration.