The correct answer is DEBATE.
The pattern of the question is "A : B :: C : D", where A and B are words that are related in a certain way, and C and D are words that are related in the same way. In this case, A and B are both words that are related to the concept of "stopping". BLOCKED means "to prevent something from happening", and YOLXPVW is a word that sounds like "block" when said backwards. Similarly, DEBATE means "to discuss something in order to reach a decision", and OZFMXS is a word that sounds like "debate" when said backwards.
The other options are incorrect because they are not related to the concept of "stopping" in the same way as BLOCKED and YOLXPVW. RESULT means "the final outcome of something", LABOR means "physical or mental effort", and LAUNCH means "to set something off into the air or water".
