Why is barren plateau a problem?

Question: Why are barren plateaus problematic in variational quantum algorithms? A) They make all circuits classical B) They produce flat optimization landscapes where gradients become very small C) They prevent qubits from being initialized D) They remove all measurement results Correct: B Explanation: A barren plateau is a region of the optimization landscape where gradients become extremely small. This makes training parameterized quantum circuits difficult. Topic: quantum computing / barren plateaus / training