EVS is a subject that has many themes which are again related to the daily life experiences of the children. So it is advised to teach every topic to the children by relating that topic to their real-life experiences. As indicated above the teacher asked all students to respond on how clothes are washed becauseTo relate the subject knowledge to the real-life experiences of children.To encourage students to reflect on home experiences as they have a collection of a lot of experiences at home even before coming to school.To provide a varied context of how clothes can be washed where students get connected to the context as they are already familiar.Enhance students thinking capacity as they think to collect all their experiences regarding the topic.To teach the process of cleaning the clothes as it will be useful for them in future.?Hence B, C & D are the correct options.Additional InformationSocial Disparity refers to disparities in other aspects of society such as the justice system, education, academe, business institutions, as well as politics. But here in the above discussion, there is no scope for social disparity so option A is wrong.