Food poisoning will probably the cause
it should be every citizen´s moral duty to defend their country,therefore strengthening their citizenship ties. All citizens,men and women should have the right to fight for their homeland encouraging fairness,and finally mandatory service would unite the country against whatever threat.
The correct answer is:
(D) All of the above.
That is an opinion, because the answer can vary by person.
The author is using irony because although Veronica took vitamins and exercised every day to make sure she's healthy during her vacation, she still got sick. Many people would've thought that Veronica wouldn't get sick since she's doing all these things to stay healthy, but in the end people get an unexpected outcome.