Why does a dancer spin faster when pulling their arms closer to their body?
Pulling arms closer reduces the moment of inertia (I). With no external torque, angular momentum (L = Iω) is conserved, so ω increases as I decreases. As per NCERT, applying relevant law/formula with correct units and sign convention leads to Due to conservation of angular momentum. This satisfies dimensional consistency and physical conditions given, so option B is scientifically correct.
Ref: NCERT Class 11 Physics, Thermal Properties and Gravitation.