Reports say that a male security guard was instrumental in planning an attempted robbery at a clothes store during the course of which the manager was injured. James Daniels was attacked in the Queens Meadow Shopping Centre at approximately 19:00 hours on 5 March as he was in the process of cashing up the days takings. Two men, Tony Main and Sydney Large, have admitted to conspiring to rob the store with two others. However, both have denied any responsibility for the attack on Daniels, and claim that his injuries were the result of an accident. It is also known that: One of the two men Tony Main has a criminal record. An ambulance was seen leaving the Queens Meadow Shopping Centre at 19:30 on the day of the attempted robbery. A shopper reported that she had seen two women hurrying towards the entrance to the car park at about 7:00 pm. When questioned Susan Main and Tessa White admitted to having been in the Shopping Centre on the evening of 5 March. Brian Jacks, a cousin of Tessa White is employed as a security guard at the Queens Meadow Shopping Centre.

Question: Tony Martin and Sydney Large were co-conspirators in the attempt to rob the clothes store.
Options:
A. true, B. false, C. uncertain
Answer: "A"