In order to introduce the topic on ‘Nutrition’ in class more effectively, a teacher should

Correct option is A

The correct answer is ask the students to open their tiffin boxes, see the contents, followed by teacher’s explanation.
The idea of asking students to open their tiffin boxes is most effective because different students have different types of eatable contents in their tiffin boxes, hence different varieties of nutrients. The teacher should apply this method as students would understand better if they have the food in front of them.