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The following ratio is generally constant for a given species:

1. A + C
  C + T
2. T + C
  G + A
3. G + C
  A + T
4. A + C
  T + G

Correct Option: C

According to Chargaff purines and pyrimidines are in equal amounts. Purine (adenine) is equimolar with pyrimidine (thymine) and purine (guanine) is equimolar with pyrimidine (cytosine).

Base ratio	A + T	is specific for species.
	C + G