The two correct examples of situational irony are:
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A police station gets robbed. - This is ironic because a police station is expected to be a place of safety and law enforcement, so the idea that it could be robbed creates a contrast that is unexpected.
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A person prepares a meal for his friends, and while he turns to call them to the table, his dog grabs the roasted chicken and runs out the dog door. - This scenario is ironic as the person has gone through the effort of preparing a meal, and instead of enjoying it with friends, the dog unexpectedly ruins the situation.
The other options do not present situational irony in the same way.