If the azimuthal quantum number of an electron is zero, then the shape of its orbital will be
Spherical
The explanation for the correct option: (B)
The explanation for the incorrect options:
(A) There is no orbital having a circular shape.
(C) There is no orbital having the elliptical shape
(D) The shape of the p-orbital is dumb-bell and in the p-orbital, the azimuthal quantum number of an electron is one.
Hence option (B) is correct - If the azimuthal quantum number of an electron is zero, then the shape of its orbital will be spherical.