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[A]: Adenine can not pair with cytosine....

[A]: Adenine can not pair with cytosine.
[R]: Because there would be two H-atoms near one of the bonding positions and none at the other.

A

If both A and R are true and R is the correct explanation of A

B

If both A and R are true but R is not the correct explanation of A

C

If A is true and R is false

D

If both A and R are false

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The correct Answer is:
B
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