It depends on what country I'm living in. If i lived in a place that Germany took over, I'd either go in hiding or flee. If i was in a place that Germany had no control over, I would do several things. I'd get as many jobs as I could and take any job that I could. I would do this because many things would be scarce during the war and therefore expensive. I would also do this to try and get home with a bomb shelter nearby with supplies. Then, I'd make sure I have a bag packed lightly with certain necessities in case I would have to quickly evacuate.
Answer:
Considering the situation described above, the best action to take is to "research the source of the article to evaluate its credibility and reliability."
This is because social media has been found many times without a number where rumors and opinions travel easily.
Also, because an incendiary headline is a sensational headline that writers or bloggers use to attract readers, there is a high tendency that the article content might be false or just an opinion.
Therefore to be sure about the article's truthfulness sent to me, I need to research the source to evaluate its credibility and reliability.
Remember that D is just an unknown number "5 more than" means add 5 onto a number. 8 is "5 more than 3", 20 is 5 more than 15. "5 more than d is" d+5