Assertion : The position-time graph of a uniform motion in one dimension of a body can have negative slope. Reason : When the speed of body decreases with time, the position-time graph of the moving body has negative slope.

• A. If both assertion and reason are true and the reason is the correct explanation of the assertion.          
• B. If both assertion and reason are true but reason is not the correct explanation of the assertion.          
• C. If assertion is true but reason is false.
• D. If the assertion and reason both are false.          
• E. If assertion is false but reason is true.