Answer:
For question 10, the answer would be B)
For question 11, the answer would be C)
Explanation:
In question one, the paragraph states that rubies, sapphires and emeralds are all harder to find than diamonds. Therefore we know that choices A) and C) are both false.
In question two the paragraph states that lignite is a low-grade coal, so we know that lignite cannot be the answer to "Which form of coal is the oldest and highest quality". If you continue reading, the paragraph goes on to state that lignite will become bituminous, which will become anthracite. The paragraph states that anthracite burns very well. Therefore we know that anthracite is both the oldest and highest quality out of the 3 options.