The correct answer should be <span>It explains that he could not find the specific salt needed to make his transformation.
He found the salt but it wasn't the original salt he used. That is because the first batch of salt that he used was impure and he didn't know this. When he bought the salt again it was the regular version that didn't have the impurity which caused his transformation.</span>
After taking the test and reading the excerpt from your question I can tell you that the correct answer to your question is B) It explains that he could not find the specific salt needed to make his transformation. Dr. Jekyll could not find the salt he need so this make b) the right answer.
