I guess you forgot to add the picture or so.
Based on the Complementarity of the 4 nucleotides, The thymine must always be placed in front of the Adenine, and the Cytosine must always be placed in front of the Guanine.
Any change in this rule causes the deformation of the DNA, and can sometimes cause fatal diseases like the melanoma (skin cancer) etc...
Hope this Helps! :)
Since you say ‘which’ , in order to answer you, we would need the options you are given, but my answer would be
1. Not reusable
2. Might use up someday
3. Burning it will produce carbon dioxide and worsen global warming
Hope these can help :)
