The correct answer is option 'A', which means that C7H7Cl has 4 benzenoid aromatic isomers.

Benzenoid aromatic compounds are cyclic compounds that contain a benzene ring. They are characterized by having alternating single and double bonds in the carbon ring, as well as fulfilling the criteria for aromaticity, such as having a fully conjugated pi system and meeting Hückel's rule.

To determine the number of benzenoid aromatic isomers for C7H7Cl, we can start by examining the possible positions of the chlorine atom on the benzene ring.

1. Chlorine in the 1-position:
- In this isomer, the chlorine atom is attached to one of the carbon atoms directly adjacent to the benzene ring.
- There are two possible positions for the chlorine atom in this isomer: ortho (1,2) and para (1,4).

2. Chlorine in the 2-position:
- In this isomer, the chlorine atom is attached to the second carbon atom from any side of the benzene ring.
- There is only one possible position for the chlorine atom in this isomer: ortho (2,3).

3. Chlorine in the 3-position:
- In this isomer, the chlorine atom is attached to the third carbon atom from any side of the benzene ring.
- There is only one possible position for the chlorine atom in this isomer: ortho (3,4).

4. Chlorine in the 4-position:
- In this isomer, the chlorine atom is attached to one of the carbon atoms directly opposite to each other on the benzene ring.
- There are two possible positions for the chlorine atom in this isomer: meta (2,4) and para (1,4).

Therefore, there are a total of 4 benzenoid aromatic isomers for C7H7Cl:
- Ortho and para isomers with chlorine in the 1-position.
- Ortho isomer with chlorine in the 2-position.
- Ortho isomer with chlorine in the 3-position.
- Meta and para isomers with chlorine in the 4-position.