Image copyright Google Image caption Crews were called to Whimpwell Green, near Happisburgh The fire service has been dealing with a "hazardous substance" near the Norfolk coast. Four crews plus the Environmental Protection Unit were called to Whimpwell Green, near Happisburgh, just before 03:00 GMT. Norfolk Fire and Rescue Service said it was a "low level" substance which posed "no harm to the public" and it had made the area safe. It is being removed by waste contractors.
Does this next sentence follow, given the preceding text?
The crews tested the substance twice to make sure. 

Pick your answer from:
(a). Yes;
(b). It's impossible to say;
(c). No;
(b).