Azimuthal quantum number defines:

The correct option is B angular momentum of electron.
The azimuthal quantum number is a quantum number for an atomic orbital that determines its orbital angular momentum and describes the shape of the orbital. The azimuthal quantum number is the second of a set of quantum numbers which describe the unique quantum state of an electron It is also known as the orbital angular momentum quantum number, orbital quantum number or second quantum number, and is symbolized as $l$
The values of azimuthal quantum number vary from zero $\left(0\right)$ to $(n-1)$ where $n$ is principle quantum number designating the size of the orbital and the energy level of electrons.

Value for $l$	0	1	2	3	4	5
Notation for:	$s$	$p$	$d$	$f$	$g$	$h$