Explain 9th ques and answer as well

Dear Student,

Static electricity developed in the metal body of the vehicle due to the friction has to be nullified for the safe transport of the inflammable material. The electric field due to the static energy build up can result in sparks which can trigger combustion of the inflammable material. So, to metallic rope like conductor is used to discharge the static charges accumulated on the metallic body of the vehicle.  

So the correct option is (3).

Regards

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