Please Answer if you know this. I will name you the BRAINLIEST!

You can tell which way a river flows because it ____________________.


A. makes a "V" which points downstream

B. makes a "U" which points uphill

C. makes a "V" which points upstream

D. makes a "V" which points downhill

E. makes a "U" which points downstream

F. makes a "U" which points upstream


Is it A, B, C, D, E, or F?