Final answer:
The question lacks context to determine a specific sequence of nitrogenous bases as DNA sequences vary. Nitrogenous bases in DNA include adenine (A), thymine (T), cytosine (C), and guanine (G), where adenine and guanine are purines and cytosine and thymine are pyrimidines. option c is correct.
Step-by-step explanation:
When constructing DNA from the bottom to the top, the order of the nitrogenous bases/nucleotides depends on the specific sequence at hand, as DNA sequences vary. However, each strand of DNA is read in the 3' to 5' direction when being synthesized, meaning that the order given (from bottom to top) would be reversed during replication.
The nitrogenous bases include adenine (A), thymine (T), cytosine (C), and guanine (G). Among these, adenine and guanine are classified as purines, while cytosine and thymine are pyrimidines. Answer options a-d do not provide enough context to determine the correct sequence without additional information on the specific DNA sequence in question.