Which Gives Rise to Equatorial Upwelling

Which gives rise to equatorial upwelling?

A) Walker cell deflection causes cooler surface waters to deflect to the northwest,causing warmer waters to replace the dispersing surface water.
B) Coriolis deflection causes warmer surface waters to deflect to the southwest,causing warmer waters to replace the dispersing surface water.
C) Coriolis deflection causes warmer surface waters to deflect to the northwest causing deeper,cooler waters to replace the dispersing surface water.
D) Coriolis deflection causes cooler surface waters to deflect to the east,causing deeper,cooler waters to replace the dispersing surface water.