Magnetic Quantum number determines

Correct option is B

Solution
Concept:
· Neils Bohr proposed Bohr's postulate which explained that a nucleus (positively charged) is surrounded by negatively charged electrons.
· According to Bhor, Electron which is moving in an orbital does not lose or radiate energy and atom came as a modification to Rutherford’s model of an atom.
· Postulates of Bohr’s model of an atom are:
· In an atom, electrons move in a fixed circular path around a positively charged nucleus. This path is known as orbits or shells
· These orbits or shells have  fixed energy.
· The energy levels are represented by an integer (n = 1, 2, 3, 4, …) known as a  principal quantum number.
· If an electron moves from lower energy level to higher energy level, then it will do so by gaining energy and if it moves from higher energy level to lower energy level then it will do so by losing energy.
Explanation:
· Quantum number are those numbers that designate and distinguish various atomic orbitals and electrons present in an atom.
· There are four types of quantum number:
· The angular quantum number determines the  three-dimensional shape of the orbital quantum number.
· Denoted by the symbol ‘l’ is also known as orbital angular momentum or subsidiary quantum number.
· It defines the  three-dimensional shape of the orbital.
· Principal quantum number
· ​Denoted by the symbol ‘n’.
· Determines the  size and to a  large extent the energy of the orbital.
· Magnetic orbital quantum number
· ​Denoted by the symbol ‘ml’.
· Gives information about the  spatial orientation of the orbital concerning standard set of co-ordinate axis.
· Electron Spin quantum number
· ​Denoted by the symbol (ms) refers to the  orientation of the spin of the electron.