Populations are positively and negatively affected by a variety of biotic and abiotic factors, including the cycles of matter. Every autumn between September and November, Canadian geese will migrate from their breeding grounds in Canada to warmer Southern locations. However, in the spring between February and March, the geese will return to Canada. Which abiotic factor would likely have the greatest effect on Canadian geese migration?

Afluctuations in the carbon cycle.
Bfluctuations in the nitrogen cycle.
Cfluctuations in the phosphorus cycle.
Dfluctuations in seasons