Between the primary and secondary rainbows, there is a dark band known as Alexander's dark band. This is because

Options

A. light scattered into this region interfere destructively
B. there is no light scattered into this region
C. light is absorbed in this region
D. angle made at the eye by the scattered rays with respect to the incident light of the sun lies between approximately `42^(@) and 50^(@)`

Explanation

Alexander's dark band lies between the primary and secondary rainbows, forms due to light scattered into region interfere destructively.
Since primary rainbow substends an anle nearly `41^(@) to 42^(@)` at abserver's eye , whereas secondary rainbows subtends an angle nearly `51^(@) to 54^(@)` at observer's eye w.r.t. incident light ray
So, the scattered ray with respect to the incident light of ths sun lies between approximately `42^(@) and 50^(@)`.