question: Why did the Decepticons allow five Pillars and Sentinel Prime to remain in the Ark ?
answer: To lure the Autobots into a trap
turker_answer: The Decepticons allowed five Pillars and Sentinel Prime to remain in the Ark to lure the Autobots into a trap .
rule-based: The Decepticons allowed five Pillars and Sentinel Prime to remain in the Ark to lure the Autobots into a trap .