Two masked gunmen held up the only bank in Tuisdale at 10.30 on Wednesday 23 May. They made a successful getaway with over £500,000. The police say that three men are helping them with their enquiries. It is also known that: Four people work at the bank. Six customers were in the bank at 10.30. No shots were fired. Ms Grainger left the bank at 10.28 on Wednesday 23 May. All the people in the bank were made to lie on the floor face down on their stomachs. The police chased the getaway car for 16 km, and then lost it. An alarm alerted the police to the hold-up. A red Ford Mondeo drove away from the bank at high speed at 10.30 on Wednesday 23 May.

Question: The cashier pressed an alarm in the bank, which is connected to the police station.
Options:
A. true, B. false, C. uncertain
Answer: "C"