Answer:
Active: Unknown factors delayed the 9:15 train from Pittsburgh.
Passive: The 9:15 train from Pittsburg was delayed by unknown factors.
Explanation:
The sentence is already active. The object of the sentence is ‘the train from Pittsburgh’ and the subject is ‘unknown factors’. The subject of the sentence performs an direct action over the object (delayed), so it is an active sentence. When we give more importance to the object of the sentence it becomes passive, as it is stated in the second sentence: The 9:15 train from Pittsburg was delayed by unknown factors.
It is important because the sources tell you whether the article was credible. When you have an article that has bad source, you are running the risk of having, wrong, opinionated data. This can discredit you paper if you use it.
If you could supply the passage, i’ll gladly help
The answer is B. You must explain your evidence so your reader know how to interpret it