Fill in the blanks with most appropriate option.
Although a number of objects, such as kites, birds, aeroplanes move in space, but their shadow is not seen on the earth. This is due to the reason that the (i), the region of complete (ii) is not able to reach the earth. The region of partial (iii), that is the (iv) reaching the earth is too large and too faint to be visible to us.
(i) | (ii) | (iii) | (iv) | |
A | Penumbra | Darkness | Brightness | Umbra |
B | Penumbra | Brightness | Darkness | Umbra |
C | Umbra | Darkness | Brightness | Penumbra |
D | Umbra | Brightness | Darkness | Penumbra |