Consider the following equilibrium in a closed container\[{{N}_{2}}{{O}_{4(g)}}\rightleftharpoons 2N{{O}_{2}}(g)\]At a fixed temperature, the volume of the raction container is halved. For this change, which of the statements holds true regarding the equilibrium constant \[({{K}_{p}})\]and the degree of dissociation \[(\alpha )?\]

• A. Neither \[{{K}_{p}}\]nor a changes
• B. Both \[{{K}_{p}}\]and a change
• C.  \[{{K}_{p}}\]changes but a does not change       
• D. \[{{K}_{p}}\]does not change but a change