This sentence effectively uses adjective clauses ('that was groundbreaking' and 'that changed medical treatment forever') to subordinate the less important information while keeping the main idea ('The scientist made a discovery') as the independent clause. The other options either create awkward structures, comma splices, or lose the logical relationship between the ideas. Effective subordination helps establish hierarchy among ideas and creates more sophisticated prose.

Break down complex topics into smaller, manageable chunks for easier recall.

Zambia

• Naomi Miselo – 31 pts

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