Answer:
The correct answer will be option-C.
Step-by-step explanation:
The scientist has suggested that organization of life on earth move from the simplicity to complexity. The living organism is the result of the aggregation of the macro-molecules which are composed of the atoms and molecules.
In the given question, the simple organization level is the molecule which aggregate to form organelles followed by the cell. The cell form tissues and tissues form the organ and organ system.
The molecules forms mucous cells (cells) which form simple columnar epithelial (tissue). The epithelial cells form the stomach (organ) and digestive system (organ system).
Thus, Option-C is the correct answer.