What indicates the arrival of a hurricane within 24 to 36 hours?

A
The normal swell becoming lower and from a steady direction
B
Long bands of nimbostratus clouds radiating from a point over the horizon
C
The barometer drops 2 millibars between 1000 and 1600
D
Unusually good weather with above average pressures followed by a slow fall of 4 millibars in six hours
E