This stimulus is full of conditional statements. We have
Kind - >Want person to prosper
Two people dislike each other - >not fully content
Two people who do not dislike each other - >kind
We can combine all of these conditional statements together if we take the contrapositive of the second conditional statement
Fully content - >two people who do not dislike each other - >kind - >want person to prosper
This is a must be false question, so the correct answer choice is going to violate this conditional chain in some way.
(B) says, "Some people who are fully content in each other's presence do not want each other to prosper."
(B) must be false based on the conditional chain we've made because we know that anyone who is fully content (sufficient condition) must want the other person to prosper (necessary condition at the end of the chain). Therefore, it is impossible for people who are fully content in each other's presence to not want each other to prosper, so (B) must be false and is the correct answer choice.
Does this make sense? Let us know if you have any other questions!