Answer:
C, D, and E are all correct.
Step-by-step explanation:
A summary should highlight the text's key points, so A can be ruled out. A summary should not have anything to do with the writer's beliefs, so B can also be ruled out.
C, D, and E are correct because:
In a summary the central idea should be stated, as well as any important details. The language should be subjective to ensure an accurate summary.