I believe that the correct answer is D because it is already stated once that they need the sirens so it is giving us a fact that has already been stated.
Details usually support the main idea
I would go with the 3rd option
One thousand three hundred forty five point zero eight
Since 1967, this day is celebrated on the 2nd of April which is also the birthday of Hans Christian Andersen who was a children’s author famously known for his fairy tale the little mermaid and children’s book the ugly duckling. This is done to inspire children to love reading and bring attention to children’s books as a lot of them help mould us into the people we are today career wise and personality wise.
