According to paragraph 3, one factor contributing to success of the earliest Roman-style construction projects in Britain was A. the fact that long before the conquest many civilian workers from Gaul and Germany had settled in Britain B. the rapid development of characteristically Romano-British styles C. the availability, in northeast Gaul, of structures that could serve as standards to be copied D. the use, by administrators, of personal connections to bring craft workers form Gaul into contact with Britons