Final answer:
If an equation has no solution, the answer should be 'No solution'.
Step-by-step explanation:
If an equation has no solution, the answer should be No solution. This means that there are no values that satisfy the equation. For example, if we have an equation like 2x + 3 = 2x + 5, we can subtract 2x from both sides to get 3 = 5, which is not true. Therefore, there are no solutions to this equation. Option D, No solution, is the correct answer.