The error is in option C. The correct sentence should be:

☀ A: There is no error in option A. The sentence is grammatically correct: "A lot of travel delay is caused."

☀ B: There is no error in option B. The sentence is grammatically correct: "due to the inefficiency and lack of good management."

☀ C: The error is in option C. The phrase "on behalf of the management" is not suitable in this context. "On behalf of" means acting as a representative of someone or speaking for someone, which doesn't fit here. Instead, the correct phrase is "by the management" to indicate that the delay is caused by the management.

☀ D: The statement "No error" is incorrect because the error is in option C, as explained above.