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While teaching the topic 'Friction' to class V students, a teacher gave a number of examples to explain that friction is also useful to us in many ways. Which one of the following examples was quoted by her incorrectly?                (CTET Jan 2012)

A) We are able to write due to friction between the tip of the pen and the paper

B) We are able to walk because of friction between our shoes and the ground

C) An object thrown vertically upwards always comes back to us due to friction

D) A vehicle stops on application of brakes