Concept:Encourage students to think and discover answers on their own instead of giving direct explanations.Explanation:Radha should ask Geeta to first compare poori with other puffed foods like chapati (option B). This helps Geeta make connections and think critically.Then, Radha should ask Geeta to think about the reason why poori puffs in hot oil (option C). This develops inquiry and reasoning skills.Option A gives a direct scientific fact without involving Geeta’s thinking. Option D is unrelated to poori puffing.Thus, the best approach is to use options B and C together.Answer:B (B and C)