Assuming That the Concept of a River Continuum Is Correct

Multiple Choice

Assuming that the concept of a river continuum is correct, how would a second-, third-, and fourth-order river be ranked, in terms of the importance of terrestrial vegetation as a food source for the organisms within it?

A) Fourth order > third order > second order
B) Third order > second order > fourth order
C) Second order > fourth order > third order
D) Second order > third order > fourth order