Which mechanical layer of Earth is creating rift valleys?

Which statements about wells are true? check all that it will tell me if you are wrong : a) wells bring groundwater from the unsaturated zone to the surface of the water. b) wells need to be drilled below the water table. c) if water is pumped from a well too quickly, the well may run dry. d) water from wells is generally not safe to drink. e) water gushes from artesian wells due to pressure.