A container has a vertical tube, whose inner radius is 12.00 mm, connected to it at its side, as shown in the figure. An unknown liquid reaches level A in the container and level B in the tube-level A being 5.0 cm higher than level B. The liquid supports a 20-cm high column of oil, between levels B and C, whose density is

The gauge pressure at level B is closest to

◦ 630 Pa.
◦ 310 Pa.
◦ 470 Pa.
◦ 940 Pa.
◦ 790 Pa.