The correct option is C Altitude
The altitude of these peaks plays the most important role in determining the temperatures experienced despite them being located close the Equator. At altititudes such as that of Aconcagua (6,969 m) or Tres Cruces Sur (6,748 m), or even places such as Quito (2,700 m) for that matter, factors like ocean currents and location begin to lose their importance.