Which currents carry warm water away from the equator?
a. deep currents
c. surface currents
b. evaporation
d. freezing

The answer top the question given above is letter c. Surface currents.
There are two types of ocean currents, surface current and deep currents. 
Surface currents which are caused by winds,move warm water away from the equator and cool water away from the poles. Deep currents on the other hand are driven by differences in water density.