Final answer:
The organ system is the most inclusive level of biological organization among the given options, as it encompasses organs, which contain tissues, made up of cells with organelles composed of molecules.
Step-by-step explanation:
The question pertains to the hierarchy of biological organization. The levels of organization in biology range from the smallest, which is the molecule, to the largest, which is the biosphere. The sequence representing the hierarchy from the most inclusive to the least complex level is organ system, which includes tissues, organs, cells, organelles, and finally molecules. Organ systems consist of different organs that work together to perform complex functions. Each organ is made up of various tissues, which are formed by groups of similar cells. Cells contain organelles that perform specific tasks and are built from complex molecules. Therefore, the most inclusive of the given options is organ system (D).