A short chain is usually attached to the rear side of petro tanker trailing behind it to ensure that the
-
A.
charges generated by friction in the tanker are conducted to the earth -
B.
chain vibrates in resonance with the tanker’s engine -
C.
heat generated by friction in the engine is conducted to the earth -
D.
petrol tanker is balanced on the road -
E.
tanker does not exceed a certain speed limit