TA: Bitcoin Price Makes U-Turn, Why BTC Could Tumble to $18K
Bitcoin started a fresh decline below the $20,000 support zone against the US Dollar. BTC traded below $19,000 and remains at a risk of a move to $18,000.
Below is an instruction that describes a task. Write a response that appropriately completes the request.

### Instruction: TA: Bitcoin Price Makes U-Turn, Why BTC Could Tumble to $18K

### Response: Bitcoin started a fresh decline below the $20,000 support zone against the US Dollar. BTC traded below $19,000 and remains at a risk of a move to $18,000.