Assertion : Position-time graph of a stationary object is a straight line parallel to time axis. Reason : For a stationary object, position does not change with time.

• 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. \[\frac{1}{{{\lambda }_{\beta }}}=\frac{1}{{{\lambda }_{\alpha }}}+\frac{1}{{{{{\lambda }'}}_{\alpha }}}\]   
• D. If the assertion and reason both are false.    
• E. If assertion is false but reason is true.