Answer:
D. She knows that the lye she uses to make soap can also confirm whether the rock is gold.
Explanation:
In the text she says that if the rock is gold, it would not be harmed by the lye. This affects the plot because now they know that there will be a truthful possibility whether they found gold or not.
Answer:
The key to building suspense is making readers care about characters they slowly learn more about.
I agree with the person above - the complete subject of this sentence is D. a group of men.
I know he stole the necklace
This is best grammar for your sentence