C. Exactly 4 Meters
This is one of those questions that sounds difficult, but it is very simple(almost like a trick question). They tell u anything below the surface of the water is a negative #. Then they tell u he lets a ring drop to the bottom of a pool which is 4meters. They just just told you that the bottom of the pool from surface down is -4 meters. Well they basically are telling u it doesn’t matter if he is on the side of the pool and tosses the ring in, or if he is on a 3 or 10 meter board. They just gave u the answer—look at they gave you, they tell u anything “below the waters surface is a negative #?and the answer for the rings location they tell u 2 things it’s at the bottom of the pool and it is also -4 meters. This is how you know the pool is -4 meters deep.