Final answer:
The symbol that is blue with clumps of grass represents a river, as blue is used for water on maps and grass often grows along riverbanks.
Step-by-step explanation:
If you see a symbol that is blue and has clumps of grass, what would this be? Among the given options, the symbol represents a c) A river. This is because the color blue is commonly used to depict water on maps, and clumps of grass are often found along riverbanks. The other options -- a mountain, a forest, and a desert -- would not typically be represented by a combination of blue color and grass clumps. Mountains might be shown in brown or gray and are often depicted with triangle shapes or elevation contours, whereas forests are represented with tree symbols. Deserts are generally depicted with tan or brown and are often shown as empty spaces or with dune symbols since they are dry ecosystems with very little rainfall and sparse vegetation.