Which elements form most of the protoplasm?

1. The chapter section 2.9 lists the common protoplasm elements. 2. It names carbon, hydrogen, oxygen, nitrogen, sulphur, iron and phosphorus. 3. C, H, O, N and S dominate; iron and phosphorus appear in trace amounts. 4. So option A lists the major elements. _Source: Selina Concise Biology Class 9, Ch 2 Cell, the Unit of Life (Mistral OCR'd PDF), section 2.9 Protoplasm_