At 3 am on 15 November the body of a young private soldier, Peter Adams, was found 25 kilometres south of Darlington, beside the railway line from Edinburgh to London. He was absent without leave from his army base where he was due to face a disciplinary hearing. A wallet found on his person contained a small sum of money, a family photograph, an identity card, an out-of-date service railcard and a single railway ticket from Edinburgh to Peterborough. It is also known that: The private had been drinking heavily and arguing with a fellow soldier, Mike Finnegan, in the buffet at Edinburgh station at 9.30 pm on 14 November. Adams had recently been seen at a disco in the company of Finnegans 17-year-old daughter Susan, for whom he had been buying drinks. Adams and Finnegan had continued to drink and argue on the overnight train from Edinburgh to London. Finnegan was overheard to threaten Adams with a beating unless he stopped taking his daughter to discos and buying her drinks. Finnegan was seen to get off the train at Darlington at 1.45 am and head off from the station in the direction of the town centre.

Question: The relationship Private Adams was having with Susan was the sole cause of the quarrel between him and Mike Finnegan.
Options:
A. true, B. false, C. uncertain
Answer: "C"