In Balmer series of lines of hydrogen spectrum, the first line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?

The line at red end suggests that
First line in Balmer series n=3 to n=2.
Second line in Balmer series n=4 to n=2.
Third line in Balmer series n=5 to n=2.

Electrons jump from n=5 to n=2 .

Hence, the correct option is D.