The correct options are
B Physical features without any slopes cannot be represented correctly.
C If there is a really steep slope then the shadow that’s formed is really dark because of which details of reliefs on the steep side of the slope are lost.
There are two major disadvantages of the hill shading method.
If there's a really steep slope then the shadow that’s formed is really dark because of which details of reliefs on the steep side of the slope are lost. Similarly for a plain slope that is well illuminated, minor reliefs cannot be seen appropriately.