Through which does light travel best? a. matter
b. empty space
c. equally well through matter and empty space

The thing through which light travels best is definitely empty space, because there are fewer atoms so that they can get in photons way. So, obviously the second option is the only correct one -  b. empty space. Other options are completely wrong and just make no sense.

answer and explanation;

composition refers to both the types of minerals within a rock and the overall chemical makeup of the rock while texture refers to the size and arrangement of the minerals or grains that make up a rock. both composition and texture can be used to classify rocks, such as igneous rocks. texture describes how the rock became solid or crystallized from liquid, melted rock. composition of a rock describes the minerals that make up a particular rock.