Final answer:
The correct example of a run-on sentence is option B: 'Don't trespass on his land, he may call the police.'
Step-by-step explanation:
A run-on sentence occurs when two or more complete sentences are not separated by any punctuation. The correct example of a run-on sentence in the given options is:
B. Don't trespass on his land, he may call the police.
In this sentence, two complete sentences, 'Don't trespass on his land' and 'he may call the police,' are not properly separated. To correct this run-on sentence, you can add a coordinating conjunction, such as 'and,' between the two clauses: 'Don't trespass on his land, and he may call the police.'