The following ratio is generally constant for a given species (a) A + G/C + T
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According to Chargaff's rules, DNA of an organism always has equal amount of purines and pyrimidines. These bases are always in the ratio of 1:1. This is because amount of guanine is equal to cytosine and the amount of adenine is equal to thymine. Hence, Thymine (T) + cytocine (C) = Guanine (G) + adenine (A). This ratio is generally constant for a given species and is also used to identify the source of DNA.
Thus, the correct answer is option B.
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