When at rest a liquid stands at same level in the tubes shown . But as indicated a height difference of 'h' occurs when the system is given an acceleration towards right. then 'h' equals

Question

$ a)\;\frac{aL}{2a} \\ b)\;\frac{gL}{2a} \\ c)\;\frac{gL}{a} \\d)\;\frac{aL}{g}$