A Piece of Iron Sinks to the Bottom of a Lake

Multiple Choice

A piece of iron sinks to the bottom of a lake where the pressure is 21. atm. Which statement best describes what happens to the volume of that piece of iron?

A) There has been no change in the volume of the iron.
B) Its volume decreases slightly.
C) Its volume increases slightly.
D) Its volume becomes 21. times greater.