Option A will only work if the sentence was "Each size of a pallet is approximately as large as the size of a refrigerator..."
The answer would be a Semicolon i believe.
Answer:
I would have to say dirt: grass
Explanation:
I think this not just because I don't know the answer its because you said page: book and they are close to each other so dirt: grass are close to each other.
Answer:
A
Explanation
Seems the most reasonable answer to me, hope this helps :)