48 Which of the following statements is TRUE?
(A) Approaches to the inquiry of physical and mental development of human beings have been much the same.
(B) It is commonly accepted that the physical structure of the organism is environmentally determined.
(C) Human organisms have arms rather than wings because of their learning experience.
(D) The physical structure of human organisms is subject to genetic control, although external factors in part influencecertain aspects of development.