Theme refers to an idea or topic introduced expanded in the syllabus on which all the units and lessons depend. Sub-themes are the parts of main themes which help to understand the main themes in a detailed and descriptive way. Main themes in EVS Family and FriendsFoodShelterWaterTravelThings We Make and DoSub-themes of "Family and friends":- Relationships;Work and Play;Animals;Plants. We can clearly distinguish that "Relationships" is not the main theme but it's the sub-theme of "Family and friends", hence "Relationships" is the only sub-theme in the above-given options.