Final answer:
A visitor may be asked to leave the dog park for throwing a ball for his dog within the fenced area, as dog toys are not permitted in that space.
Step-by-step explanation:
If a visitor is asked to leave the dog park, according to the passage provided, the most likely cause would be C. The visitor threw a ball for his dog to fetch within the fenced area. This activity goes against the park rules which state that no food or dog toys are allowed inside the fenced area.
According to the passage, the visitor would be asked to leave the dog park if they allowed their dog to dig holes in the sand of the beach area. The passage states that no food or dog toys are allowed inside the fenced area, but it does not mention anything about eating snacks while playing with dogs outside of the fenced area (option A).
The passage also does not state anything about the time the visitor brought their dog to the park (option B) or throwing a ball for their dog to fetch (option C).
Choice A would not be a cause for ejection because eating a snack outside of the fenced area is not prohibited, and B does not apply since extended hours is a park feature not a rule violation. Lastly, D cannot be confirmed as a violation from the given passage as it doesn't specify rules about digging in the beach area.