Answer: The correct answer is thymine.
Step-by-step explanation:
DNA is known as deoxy ribonucleic acid. This molecule contains 4 nitrogenous bases, which are adenine (A), thymine (T), cytosine (C) and guanine(G). This molecule forms double helix structure.
Adenine formed two hydrogen bonds only with thymine and cytosine forms three hydrogen bonds only with guanine.
Thus, the amount of adenine (A) will be equal to the amount of thymine (T).