Answer
c.
Work Step by Step
a. Air is a homogeneous mixture, if it is pure.
b. Sugar dissolved in water is homogeneous because it is uniformly mixed.
c. Muddy river is heterogeneous because sediments in the water is not mixed uniformly with the water.
d. Brass is homogeneous because is it an alloy made of an equal distribution of two or more metals.
e. Table salt is homogeneous because it is a compound made of a specific ratio.
