Teacher:In this task, you are given two facts, and a multiple-choice question. Based on the given facts, answer the question with index of the correct option (e.g, "A").
Teacher: Now, understand the problem? Solve this instance: Fact1: Echinoderms have a unique water vascular system with tube feet., Fact2: Echinoderms have a hydraulic system of locomotion called the water vascular system., Question: How do echinoderms use their feet to locomote themselves? (A) one at a time (B) to move people (C) running and lifting (D) protein channels (E) a hydraulic system (F) it needs them (G) undulations (H) It helps them survive
Student:
E