Question $3$

The unit hydrograph represents water flowing into a stream from:

I. Base flow

II$.$ Evapotranspiration

III. Overland flow

IV$.$ Surface flow

V$.$ Interflow

A$)$ I only

B$)$ I and III

C$)$ II$,$ III, IV

D$)$ III, IV$,$ V

Explain your answer.