Conditions in the south pacific during the la nina phase of enso, in comparison to the neutral phase of enso, include (choose all that apply):

a sea surface temperatures in the eastern pacific are cooler
b air pressure patterns reverse from the normal direction
c easterly trade winds decrease in strength, or reverse to westerly
d the prevailing rain pattern shifts west towards australia
e easterly trade winds are stronger
f upwelling on the west coast of south america is stronger