Two identical beads are placed at vertex $A$ of an equilateral triangle $ABC$ made of a uniform wire. The triangle is rotated about the axis $AO$. The beads are then released from rest and move along $AB$ and $AC$ respectively (see figure). Neglecting friction,which of the following quantities will be conserved during the downward motion of the beads?

• A
  Angular velocity and total energy
• B
  Total angular momentum and total energy
• C
  Angular velocity and moment of inertia about the axis of rotation
• D
  Total angular momentum and moment of inertia about the axis of rotation