The arrangement of organs and tissues in their characteristic places in 3 - D space defines A. pattern formation.
In the process of development, pattern formation can be described as a process through which the cells, tissues, or organs of a body arrange themselves to form a complex organism. It is the process by which each cell gets specialized to perform a specific function. Hence, the correct option is pattern formation.
Option B is not correct as differentiation is a process by which a stem cell changes into any of the specialized body cells.
Option C is not correct as determination is not a process of organ formation.
Option D is not correct as organogenesis refers to the formation of organs, not the arrangement of organs.
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