Answer explanation

@wills, happy to help! Answer choice (A) is incorrect because of the word "any." From the passage, we can infer that volcanic ash clouds do at least sometimes go above 5 kilometers, as this is when they can provide lightning discharge data. However, we are never told that any given volcanic ash cloud must go above 5 kilometers. It is quite possible that some volcanic ash clouds never exceed 5 kilometers/produce lightning discharges. So, (A) is incorrect because it is overly strong and the argument does not depend on it. Does that make sense? Hope it helps! Please let us know if you have any other questions!