Coral reefs can be found in waters along the  southeast  coast of...

Coral reefs can be found in waters along the southeast coast of the United States and nearby islands, but not in waters at similar latitudes on the southwest coast of the United States. Differences in which of the following environmental conditions most likely accounts for this observation?

A. Tidal cycle

B. Ocean currents

C. Day length

D. Seasonality

E. Salinity