Rocks are classified according to their composition and color,
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Rocks are classified according to their composition and color is a true statement.

Explanation:

On a broader category rocks are classified based on their process of formation as igneous, sedimentary and metamorphic rocks. These groups of rocks are further classified based on their physical properties and chemical composition.  

Physical properties like size, shape, grain patterns, hardness, cleavage, lustre, etc are analyzed to classify rocks.  

The chemical composition refers to the mineral content and the overall chemical content of the rock.  

The color of the rock is due to the chemicals or minerals present in the rocks.  

Color and composition of the rocks are interrelated and a color index is developed based on it,

Igneous rocks which are dark in color indicate a mafic composition that is rich in minerals like magnesium or iron; light colored or felsic rocks are rich in silicon.

the answer is b. 0; 4

oxygen +1 most likely