At 16.05 on Sunday 3 June, an elderly man was found dead in Cuthbert Park. His right-hand wrist had been slashed. The park keeper had seen a young man running out of the park at 15.30. The following facts are known: The park had been shut for major landscape changes. The young man was employed by the landscape contractors and worked in the park. The dead man had been diagnosed with terminal cancer on Friday 1 June. The landscape contractors do not work on Sundays. The park keeper is profoundly deaf. A sharp knife with a 16-centimetre blade was found 100 metres from the dead body. The victim was right-handed.

Question: The knife found 100 metres from the body had been used to slash the victim's wrist.
Options:
A. true, B. false, C. uncertain
Answer: "C"