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Explanation:

Zero Nitrogen Atoms

N is Nitrogen and you can see the last option C12H26 has no N. So it goes in the first box.

One Nitrogen Atom

C6H11NO2 and C10H12NO have 1 nitrogen atom so the 3rd and 4th option go in the 2nd box.

Two Nitrogen Atoms

The first option, C11H12N2O2 is the only one with 2 Nitrogen atoms and goes in box 3.

Three Nitrogen Atoms

Option 2, C7H11N3O is the only option with 3 Nitrogen atoms and goes in box 4.

not only is it colder, it also becomes darker, less salty, and more dense.