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

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Correct Answer: A