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