On 15 August at 23.30, a fire broke out in the kitchen of the Red Lion public house in Merton. The fire spread rapidly and the building was completely gutted. The fire service was called at 23.45 and arrived at 23.55. The fire was brought under control at 02.30 on 16 August. It is also known that: The landlord, Jack Dawkins, was in the pub at the time of the fire. The pub had been losing money for the past two years. Jack Dawkins had recently increased the insurance cover on the pub. The fire started in the deep fat fryer. The fire service report stated that the fire had been started deliberately. Jack Dawkins had been drinking heavily on the night of the fire. The pub had failed its last two environmental health inspections.

Question: Jack Dawkins was sober when the fire started.
Options:
A. true, B. false, C. uncertain
Answer: "B"