Robbers pretending to be police officers physically assaulted and tied up three members of staff at a city centre nightclub before making their escape with a substantial sum of money. A police spokesperson said that four individuals entered the nightclub at approximately 2:15 am on Saturday 20 January just as the owner was in the process of counting up the nights takings. The thieves were said to have been wearing uniforms (including yellow fluorescent jackets) that closely resembled those worn by the police. It is also known that: On arriving at the club the thieves said that they were responding to an urgent phone call for assistance, and that they needed to carry out an inspection of the premises to see that nothing was amiss. In carrying out the robbery one of the gang physically assaulted the owner of the nightclub. The club had been exceptionally busy that night with a large number of parties spending heavily at the bar. Afterwards the club owner said that he thought he recognized the voice of one of his assailants as being that of one of his former employees. The gang were seen to leave the scene of the robbery in a red transit van resembling one that was later found abandoned in supermarket car park.

Question: The robbery was carried out with the threat of violence but no one was hurt in the perpetration of the crime.
Options:
A. true, B. false, C. uncertain
Answer: "B"