U-tube is partly filled with a liquid a. another liquid b, which does not mix with a, is poured into one side unit it stands a height h above the level of a on

U-tube is partly filled with a liquid A. Another liquid B, which does not mix with A, is poured into one side unit it stands a height h above the level of A on the other side, which has meanwhile risen a height . The density of B relative to that of A is 2 h-2 (B) (A) h+ 2 h+2 (C) (D) 20 +h