A U-tube of uniform cross-section is partially filled with a liquid I. Another liquid II which does not mix with liquid I is poured into one side. It is found that the liquid levels of the two sides of the tube are the same, while the level of liquid I has risen by 2 cm. If specific gravity of liquid I is 1.1, the specific gravity of liquid I is 1.1,the specific gravity of liquid II must be:
(A) 1.12
(B) 1.1
(C) 1.05
(D) 1.0
