An Object Requires a Force of 30 N to Hold $850 \mathrm {~kg} / \mathrm { m } ^ { 3 }$

Multiple Choice

An object requires a force of 30 N to hold it under water. The object weighs 90 N in air. Its density is nearest:

A) $850 \mathrm {~kg} / \mathrm { m } ^ { 3 }$
B) $800 \mathrm {~kg} / \mathrm { m } ^ { 3 }$
C) $750 \mathrm {~kg} / \mathrm { m } ^ { 3 }$
D) $700 \mathrm {~kg} / \mathrm { m } ^ { 3 }$