What Is the Reason for the Very Fast Rotation of Neutron

Multiple Choice

What is the reason for the very fast rotation of neutron stars?

A) It is a consequence of the conservation of angular momentum applied to collapsing objects.
B) The convection in the cores of high-mass stars is responsible for this.
C) The high temperature in the cores of high-mass stars imprints fast rotations.
D) The degenerate iron core leads to fast spins.
E) The fast rotation is due to their huge gravity on their surface.