Answer:
The correct answer will be option A and T occur in similar proportions and G and C occur in similar proportions.
Explanation:
Erwin Chargaff proposed the rule of the base pairing of the nitrogenous bases present in the DNA.
He stated that:
1. Purine binds to pyrimidine of the complementary strand in DNA where A binds T and G binds C, therefore, A and T and G and C are present in the equal proportion.
2. The composition of DNA varies from species to species.
Thus, both the selected options are the correct answer.