Answer:
B C and D are all true.
Explanation:
In 3 minutes Thea reads 540 words. In one minute she reads 540/3 = 180 words per minute. That means that she does NOT read as many words per minute as does Elinor who reads 225 words / minute.
So what's the answer?
B is true. You could check this with 1440 / 8 = which also gives 180, so Thea is consistent.
C is true. 2 * 225 = 450. Elinor reads 450 words in 2 minutes.
D is true. You can multiply 60 * 225 and 60 * 180 to confirm that Elinor is going to get through the book faster than Thea.