a solid cyclinder rolls down a rough inclined plane without slipping .as it goes ,the force of friction 
options
1-decreseases its mechanical energy 2-its translational kinetic energy 
3-rotational ke 4 -pe

Dear Student ,
Here is a link which will help you to answer this question with proper explanation .
https://www.meritnation.com/ask-answer/question/a-solid-cylinder-rolls-down-a-rough-inclined-plane-without-s/system-of-particles-and-rotational-motion/10210729

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