A crane is used to lower weights into the sea (sea water density = 1025 kg/m$$^3$$) for an underwater construction project. What is the percentage reduction in the tension
in the rope of the crane due to a rectangular 0.4 m $$\times$$ 0.4 m $$\times$$ 3 m concrete block (density = 2300kg/m*) when it is completely immersed in water compared to the tension in
the rope when it was suspendedin air

A

45%

B

55%

C

65%

D

75%