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I must not enter a level crossing:

AIf there is no guard.
BWhen the instructions of railway agents prohibit it.Correct
CThat is not signposted.
Explanation
The driver is expressly prohibited from starting to cross a level crossing when the indications or instructions of railway agents so determine. Railway agents have the authority to regulate traffic in the crossing area with the railway line, and their orders must be strictly respected to ensure safety. The remaining options are incorrect because the absence of a guard or automatic signaling does not, by itself, prevent crossing a level crossing. In these situations, the driver can proceed, provided they do so with special caution and first ensure that no railway vehicle is approaching.
Explanation generated by artificial intelligence and may contain errors. Always confirm the information with your instructor.
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