A ballet dancer is rotating about his own vertical axis on smooth horizontal floor. `I, omega, L, E` are moment of inertia, angular velocity, angular momentum, rotational kinetic energy of ballet dancer respectively. If ballet dancer stretches himself away from his axis of rotation, then
A. `I` increases and `omega,E` decrease but `L` is constant
B. `I` decreases, `omega` and `E` increases but `L` is constant
C. `I` increase, `omega` decreases, `L` and `E` are constant
D. `I` increases, `omega` increases but `L` and `E` are constant