The Water Flowing Over Niagara Falls Drops a Distance of $4186 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K }$

The water flowing over Niagara Falls drops a distance of 50 m. If all the gravitational potential energy is converted to thermal energy, by what temperature does the water rise? The specific heat of water is $4186 \mathrm {~J} / \mathrm { kg } \cdot \mathrm { K }$

A) $0.42 \mathrm { C } ^ { \circ }$
B) $0.37 \mathrm { C } ^ { \circ }$
C) $0.10 \mathrm { C } ^ { \circ }$
D) $0.12 \mathrm { C } ^ { \circ }$