Solve the Problem $8 \mathrm {~m}$ And Height $4 \mathrm {~m}$ Is Submerged Vertically, as Shown Below

Multiple Choice

Solve the problem.
-A right triangular plate of base $8 \mathrm {~m}$ and height $4 \mathrm {~m}$ is submerged vertically, as shown below. Find the force on one side of the plate. $\left( \mathrm { w } = 9800 \mathrm {~N} / \mathrm { m } ^ { 3 } \right)$

A) 100,000 N
B) 630,000 N
C) 310,000 N
D) 420,000 N