Observe the options are , the option C is not a monomial.
Since this expression has a variable in the denominator.
The option C is not a monomial.
![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/step1.JPG\")
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, the option C is not a monomial. ![\"\"](\"http://www.mathskey.com/userfiles/image/steps_images/solution.JPG\")