Final Answer:
Fluorine has 2 energy levels (Option A).
Step-by-step explanation:
The number of energy levels in an atom is determined by the principal quantum number (n). For fluorine, the electron configuration is 1s² 2s² 2p⁵. The highest value of the principal quantum number (n) in this configuration is 2, indicating that fluorine has two energy levels. The first energy level (n=1) contains the 1s orbital, while the second energy level (n=2) includes both the 2s and 2p orbitals. The remaining options (B, C, and D) represent higher numbers of energy levels, which are not applicable to the electron configuration of fluorine.
Option A is the answer.