If you hatch an area and cant see it clearly... a.You must start over b.AutoCAD is locked up c.The scale may be wrong d.You used the wrong colour

I you are not able to see the hatch area properly may be due to choosing scale wrong. so answer of the question is Option - C "  The scale may be wrong

With a large possibility your scale is not set correct ..C) is my answer

However it is always a good idea to check you settings ....

c) The scale may be wrong

Thanks