Without data from the base composition studies of Chargaff, what might Watson and Crick's modeling studies have erroneously concluded?
A. Bases could pair with themselves (e.g., A with A, C with C).
B. Any purine could pair with any purine.
C. Any purine could pair with any purine and any pyrimidine could pair with any pyrimidine.
D. Any purine could pair with any pyrimidine.
E. Any pyrimidine could pair with any pyrimidine.
Answer: D
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