Concept:Survey helps students learn directly from the community by collecting real-life information, not by testing their survey skills.Explanation:The teacher wants students to study food preservation methods used at home. This survey has three main objectives. First, it makes students sensitive towards different people and their practices (A). Second, it gives them a chance to collect first‑hand information from the community (C). Third, it allows them to interact with community members (D). Option B (assessing students' competence in conducting survey) is not the goal here—the teacher is not testing the survey skill itself. Therefore, the correct combination is A, C, and D.Answer:B. A, C and D