Surprised there is no commentary on the first sentence and answer-choice B

The first sentence/conditional is somewhat linked to answer choice B. The first sentence is: "Leachate is a solution, frequently highly contaminated, that develops when water permeates a landfill site." Expressed in conditional form: Water permeates a landfill site-----> L develops B states: "If any water permeates a landfill, leachate will escape into the environment." Expressed in conditional form: Water permeates landfill site-----> L escapes into the environment In retrospect, B is false because L developing is different that L escaping into the environment. Talk about splitting hairs; on instinct I read through the rest of the answers and found that E is an identical match to the contrapositive. But is that why B is false, because developing L and L escaping into the environment are two different phenomena? Thank You