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A danger of looking at one mirror for too long is

A You may not see an upcoming hazard in another location
Explaination
When checking your mirrors, only look at them quickly. If you concentrate on one mirror for too long, you may travel a substantial distance down the road without being aware of what is ahead, missing important information about upcoming hazards.
B You will be distracted by potential hazards
C The mirrors may shake and move
D You may notice a dirty spot on the mirror