Q: Question: what is prefix phone number? Would "As telephone technology advanced, the precise significance of the prefix became blurred in many places; 485 in London, UK, was once the GULliver exchange, but now 44207485xxxx is just considered one of many number blocks served by the CLKEN Kentish Town exchange; 4420770703xx is another." be a reasonable answer?

Pick from:
(A). No;
(B). Yes;
The answer is:
(A).