Question

Each individuals ___ has different sequences of nitrogenous bases

Answer 1

The answer to this is most certainly not A or C, so you can rule those out. If you look at DNA, every persons has different nitrogenous bases (adenine (A),guanine (G), thymine (T), and cytosine (C)) 
This means the answer to your questions is #2, DNA.
Hope I helped you!

Answer 2

2. DNA

Nitrogenous bases (like adenine and guanine) make up a DNA molecule that we carry.