The continental divide
a. divides the united states into east and west
b. divides the united states into north and south
c. divides the flow of river systems in the united states into east and west
d. is a series of rivers and mountains that separates canada from the united states

The answer is D. is a series of rivers and mountains that separates Canada from the United States

In north america region, ( Canada , USA, and Mexico) we have 4 continental divides.

- The Great Divide( Run from alaska, through crest of rocky mountains in Canada, to Sierra Madre Mexico)
- The northern divide seperates the watershed of the Atlantic Ocean and Arctiv ocean
- The St. Lawrence Seaway Divide ( Separates great lakes from the rest of atlantic oceans)
- The Eastern continental divide ( separate watershed of the Gulf Mexico from atlantic ocean)

Water flows along the east coast and across the western tropical pacific towards south america, while they both are directed towards that way,  el niño does not directly affect the southern flow of water along the coast.