Coriolis effect, global winds and continental deflections are all factors that control
a. deep currents
c. surface currents
b. wind currents
d. density of currents

Well, at first glance I'd be tempted to say all of them. The C "force" is why weather maps show winds blowing parallel to isobars and thus around centres of high and low pressure. (You'd expect, or at least I would, that air would flow from high to low pressures, not round them ... )