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.
Can we infer the following?
The contractors might get ill from working with the substance. 

OPTIONS: a). Yes. b). It's impossible to say. c). No.
The answer is:
b).