Correct Answer: Whenever there is a fire, an automatic alarm is set off in the fire department.
Explanation:
Lets eliminate options one by one-
Option A: Cannot be true since we cannot infer anything if we know that an automatic alarm is set off at the fire department.
Option B: If sprinklers do not start then the fire alarm doesn't go off. Further we cannot say anything about the automatic alarm at the fire department.
Option C: When there is a fire the fire alarm goes off so sprinklers start. Hence an automatic alarm is set off at the fire department.
Option (D) is similarly ruled out.
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