4.
In a map, a blue color represents
(b) oceans and seas
(a) mountains
(c) forests

(b) Ocean and seas

Explanation:

Because it is the only element mentioned in the blue color.

Oceans and sea

So answer is B

# Blue represent oceans and sea Cause the lights leaving water Is Brightest the blue part of the visible light spectrum.

Explanation:

Hope I helps u

answer; primary source information;