The factor that does NOT contribute to global wind patterns is:
C. the uneven distribution of freshwater and salt water, which causes uneven heat convection
While the distribution of freshwater and salt water can influence local weather patterns and ocean currents, it is not a primary driver of global wind patterns like the other options listed. The spin of Earth, the tilt of the Earth's axis, and the uneven distribution of land between hemispheres all play significant roles in shaping global wind patterns.