Identify the methods of increasing and decreasing friction and choose the correct option. (i) The tyres of vehicles have treads. (ii) Gymnasts often apply a coarse material on their hands. (iii) Saliva in our mouth helps us to swallow food. (iv) A surgeon powders his hand before pulling on his plastic gloves

• A. (i) (ii) (iii) (iv) Increasing Decreasing Increasing Decreasing
• B. (i) (ii) (iii) (iv) Decreasing Increasing Decreasing Increasing
• C. (i) (ii) (iii) (iv) Increasing Increasing Decreasing Decreasing
• D. (i) (ii) (iii) (iv) Decreasing Decreasing Increasing Increasing