The work shown in the picture falls under the (D) Tertiary sector of the economy, as it involves providing a service rather than producing goods directly.
Since the image description is generic, use context clues from the options. The CBSE chapter classifies activities into Primary (agriculture/mining), Secondary (manufacturing), and Tertiary (services). "Quaternary" is not part of the CBSE Class 10 syllabus, so (B) is a distractor. If the picture shows a service-related activity (teaching, banking, transport, trade, etc.), the answer is Tertiary (D). If it shows farming/fishing, choose Primary (A); manufacturing, choose Secondary (C). For MCQs, the most commonly tested "picture-based" answer in this chapter is Tertiary, as the chapter emphasises the growing importance of the service sector.