Final answer:
Contrast (B) is mainly used to point out differences between objects considered to be of the same order, and it plays a key role in helping readers analyze and evaluate subjects by recognizing distinctive attributes.
Step-by-step explanation:
The item that is mainly to point out differences between objects regarded as essentially of the SAME order is (B) Contrast. Contrast specifically refers to the examination of the differences between two or more subjects that are, to a significant extent, similar. In the context of comparison and contrast strategies, while comparison focuses on both similarities and differences, contrast exclusively focuses on the differences. This can be seen, for example, in visual art where color contrast can bring vitality to a piece with stark differences like black and white, or in literature where contrasting characters or themes might be used to illuminate particular aspects of each.
Understanding the use of contrast helps readers to analyze and evaluate subjects by recognizing the distinctive attributes or opinions that set them apart. A well-structured essay might employ a combination of strategies, such as classification and division within the larger structure of comparison and contrast to further elucidate points of contention or differentiation.