Definition: You are given a question on conceptual physics. You are also given 4 answer options (associated with "A", "B", "C", "D"), out of which only one is correct. You need to answer the question by selecting the correct option. You should only answer with the choice letter, not the whole answer.
Input: When a spinning system contracts in the absence of an external torque its rotational speed increases and its angular momentum
(A)decreases (B)increases (C)remains unchanged (D)may increase or decrease

C