Oak tree species are quite abundant in the southern California landscape.These species are long-lived,even though they experience drought.What would you predict their root structure to be like?

A) They likely have shallow roots that spread out across wide areas
B) They likely have one single, shallow root
C) They likely have a very deep root structure that reaches through many layers of soil
D) They likely have a root structure that branches out but can move deeper into layers of soil when drought conditions occur.