Final answer:
Brake cleaner can be used to clean brake parts and clutches, while gasoline should not be used for this purpose.
Step-by-step explanation:
Technician A is right. Brake cleaner can be used to clean brake parts and clutches. Brake cleaner is specifically formulated to remove brake dust, oils, and contaminants from brake components, and it evaporates quickly without leaving a residue.
Technician B is incorrect. Gasoline should not be used as a cleaning solvent for brake parts or clutches. Gasoline is highly flammable and its use as a cleaning solvent can be dangerous. Additionally, gasoline can leave a residue that can interfere with the proper functioning of the brakes and clutches.
Therefore, the correct answer is A. A only.