How would you correct sentence 8?

The choice indicating that no change is needed suggests that the original sentence is grammatically correct and conveys its meaning clearly as is. This could mean that the structure of the sentence effectively connects the ideas it presents without needing any additional punctuation or modifications. In certain contexts, a simple statement followed by a related clause can flow smoothly without being interrupted by a punctuation change, making the original form appropriate.

When considering the other options, they introduce various forms of punctuation that imply a pause or break in the original thought. Each alternative may change the flow or suggest a different relationship between the ideas than what was initially intended. Thus, affirming that no change is needed supports the view that the sentence is already perfectly constructed.