Explain

@Kane44, mostly because all of the other answers are wrong. There are some question types in which there is only one answer possible. There are other question types, like principle questions like this, in which there are many possible correct answers, but only one possible correct answer is given as an answer choice. There COULD theoretically be another principle that explains Hidalgo's stance, but of the 5 principles given, (A) is the only one that fits. So you're right in identifying that A "can" be the correct answer, and it MUST be the correct answer because the other 4 are wrong.