A cubical block is floating in a liquid with half of its volume immersed in the liquid. When the whole system accelerates upwards with acceleration of g/3, the fraction of volume immersed in the liquid will be

• A.            \[\frac{1}{2}\]
• B.            \[\frac{3}{8}\]
• C.            \[\frac{2}{3}\]
• D.            \[\frac{3}{4}\]