Factual question is one of the most common question types in TOEFL reading. Out of 12 to 13 questions you get in the reading section, 2 to 3 are factual questions. This question is also one of the simplest questions in the reading section. Essentially, the question asks you to find a piece of information (a specific detail) from the reading which matches one of the answer choices. Sounds easy, doesn’t it?
There are several reasons why this question becomes difficult.
The correct answer choice is a paraphrased version of the detail in the reading.
At least two of the answer choices are also in the reading, but they do not answer the question.
The complexity of the text – though some questions can be simple, others demand you to look carefully through a very complex text.