This article is about the current oil crisis in Nigeria. The fuel subsidy in Nigeria, which made oil very cheap to be brought by people or companies, was removed on January 1, 2012 when the President Goodluck Jonathan signed the removal of the fuel subsidy. Removing the fuel subsidy not only doubled prices for practically everything from food to transportation, but in some cases tripled prices causing much turmoil in Nigeria becuase things were becoming more expensive without the income people earned increasing.
This article I feel just was telling a lot about what was going on, describing the situations. But it is considered an argumentative article because of it's credibility. The article is from BBC news, which people feel if something is said on BBC it is true. But if this same article was just an opinion piece how many people will take that person's opinion as the end all. You will probably look at other articles to see if the story was actually true and accurate. I thing credibility plays a big role in arguments. If you are a credible source, people will pay more attention and believe more of what is said.