It identifies two groups that will be discussed, -It explains the reasons invading forces did not succeed, and It uses the signal phrase for example to introduce evidence is the features of the passage are typical of a compare/contrast structure
An essay that contrasts and compares two or more subjects identifies commonalities and differences between them.
It's perfect for illustrating the differences and similarities between related things or concepts, especially if they are frequently confused with one another or unfairly grouped together.
Thus, option A, B and D are correct.
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