Can anyone check this if it’s right.

Yes this is the right answer

D. Solid cone

Step-by-step explanation:

The result of the triangle revolution will depend on the distance between the vertical line and the triangle. If the line is touching the triangle side, then the shape will be solid cone. I assume this is the case.

If there are some distance between the line and the triangle sides, you can add imaginary right trapezoid shape to make the shape look like bigger triangle that touch the line. The shape will be cone since it still triangle. This trapezoid is imaginary so will result as hollow shape. If that the case, the result is cylinder hollow cone with truncated top.

There is no way that this will result as cylinder.