A Container Has a Vertical Tube,whose Inner Radius Is 12 $320 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

Multiple Choice

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 $320 \mathrm {~kg} / \mathrm { m } ^ { 3 }$ The gauge pressure at level B is closest to

A) 630 Pa
B) 310 Pa
C) 470 Pa
D) 790 Pa
E) 940 Pa