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Answer:
Our answer is 2) DNA contains thymine, and RNA contains uracil.
Explanation:
It cannot be answer one, as uracil is rarely found in DNA and RNA never has thymine.
It cannot be answer three, as only DNA is double stranded, because RNA is single stranded.
It cannot be answer four, because they have the answer mixed up. DNA has deoxyribose, while RNA had ribose.