The correct option is A 3
Given maximum magnetic quantum number, m=+2
Value of m lies from +l to −l.
Magnetic quantum number is given as +2 so value of l is 2.
Now, l=2 can have n values of 3,4,5....
So, for minimum number of waves, value of n can be 3.
When an electron revolves in a particular Bohr orbit then number of waves made by electron is equal to orbit number (n).
Hence, the correct option is (a).