What is the role of measurement in a quantum circuit?

Question: What does measurement do in a quantum circuit? A) Converts quantum information into a classical bit outcome B) Always creates entanglement C) Reverses all previous gates D) Copies the qubit state perfectly Correct: A Explanation: Measurement converts a quantum state into a classical result. For a qubit measured in the computational basis, the output is either 0 or 1 according to the probabilities determined by the quantum state. Topic: quantum computing / measurement