Step 1: Definition of wages.
The Code on Wages, 2019 provides an inclusive–exclusive definition of wages.
Step 2: Included component.
Retaining allowance is expressly included within the definition of wages.
Step 3: Excluded components.
House rent allowance, overtime allowance, and conveyance allowance are specifically excluded from wages.
Step 4: Conclusion.
Hence, the correct answer is (B) Retaining allowance.