Which of the following sequences best describes the author's suggestion for future research on morphogenesis? A. Accumulation of data, simplification of language, explanation of morphogenesis B. Dispersion of cells, evaluation of cell activity, development of an explanatory hypothesis C. Classification of cell types, separation of cell, observation of cell activity D. Observation of cell development, description of cell behavior, explanation at the molecular level E. Differentiation of cell types, description of cell structure, analysis of molecular components