Final answer:
C) Chargaff's rule
Step-by-step explanation:
The answer to the question is C) Chargaff's rule. Chargaff's rule states that in DNA, the amount of adenine (A) is always equal to the amount of thymine (T), and the amount of cytosine (C) is always equal to the amount of guanine (G). This means that A pairs with T and C pairs with G in the DNA double helix.