Assertion: On cooling a freezing mixture, colour of the mixture turns to pink from deep blue for a reaction.\[Co({{H}_{2}}O){{_{6}^{2+}}_{(aq)}}+4C{{l}^{-}}_{(aq)}\]⇌ \[CoCl{{_{4}^{2-}}_{(aq)}}+6{{H}_{2}}{{O}_{(l)}}\]. Reason: Reaction is endothermic so on cooling, the reaction moves to backward direction. Read the assertion and reason carefully to mark the correct option out of the options given below:

• 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.