Answer
The correct answer is (d)
Work Step by Step
The naming of the compound is done in the following steps:
1. The compound is made up of non metals, has a hydrogen, and is designated as aqueous. So, it is an acid.
2. Since it is an acid and has oxygen, it is an oxyacid.
3. The oxyanion is nitrite ($NO_2^-$), so the name of the acid is $nitrous$ $acid$
Hence, the correct answer is (d).
