Answer:

Explanation:
r = Radius = 
B = Magnetic field = 3 mT
1 mm = Distance from the surface of the wire
V = Voltage
x = Distance from the probe = 
R = Resistance
L = Length of wire = 4.5 m
Magnetic field is given by

Voltage is given by

Resistivity is given by

The resistivity of the material is
.
The answer is B. Oil Spill
Information about Earthquakes would normally be shown on a map called "geologic hazards"