$\underline{\textbf{Answer:}\Rightarrow}\;\mathbf{b.}$
1 NF: atomic values
2 NF: Full Functional Dependency.
3 NF: No transitive dependency.
BCNF: Super Key
Edit: The language of this question is poorly framed as it is not mentioned whether we have a partial or full functional dependency.
So, answer can very according to the interpretations between $1-NF$ to $2-NF$.