() That is a square number, and the minimum value is 0, so x = m..

Because this part has a minimum value, the minimum value of y is X=M, and Y=- 1.

If you draw a graph, take Y=- 1 where X=M and check.

So when x is less than l, y decreases with the increase of x, which is a line from upper left to lower right. This is the first check.

If L=M, there is no problem, the description is correct, and the scope is the whole of the first inspection.

If l is less than m, the description of the correct range is part of the first check.

If l is greater than m, then some of the two strokes describing the number are obviously wrong in the range where y decreases with the increase of x.

L at first glance is less than or equal to m.

Choose C.