5 features that determines the direction of a river​

On the map below, which of the following rivers is identified by blue? the huang he river the yangtze river the han river the naktong river

Can someone me? i need to have this done as soon as possible! i'm putting 20 points on this!

If you were a casual recreational hiker with young children, which of the following trails would be least strenuous for a leisurely family outing? a. merced lake trail b. mirror lake loop trail. c. tenaya lake and tuolumne meadows trail d. el capitan trail