The correct answer is - a. patterns of wind circulation have also changed.
The ocean currents are very important in the formation and movement of the winds on our planet. If the ocean currents change their circulation patterns, it will certainly mean that the wind patterns will also be changed.
There's warm and cold ocean currents, the warm being formed in close proximity to the Equator, and the cold being formed in close proximity to the poles. The temperature of the ocean current influences the temperature of the air masses above it, so the warm ocean currents have warm air masses above them, following their track, and the cold ones have cold air masses above them, following them. If the ocean currents change their circulation patters, than the air masses will follow, thus the wind patters will change on a global level.
