I think either B or C maybe?
The answer is context clues. This is because you're using the clues from the other words (sentences/paragraphs) to answer the definition of the word.
Answer:
The author views Diane France as a creative problem solver, and writes to inform readers about the time France made a cast of her own tongue.
Explanation:
The statement that best describes Hopping’s viewpoint and purpose in this excerpt: "the author views Diane France as a creative problem solver, and writes to inform readers about the time France made a cast of her own tongue"
The excerpt actually shows that France is a creative problem solver. She actually reveals this by sharing her story when Diane France made the cast of her tongue. She actually made used of her own tools and used them in a creative way to achieve the result she had. Also, the excerpt tells readers about the time France made a cast of her tongue.
The subordinate clause is : " which had been dumped into the city water system "
