The stage of childhood in which the children generally asks the question "why" is early childhood.
The stages of childhood in the children are the stages. The children in the early stages started to learn new things and the question of "why" are asked with curiosity.
The infants years, the starting age of the children in which they start learning to speak.
The early childhood age is the period of growth where children witness new things, and the curiosity arises with the question of "why".
Thus, the stage in children when they commonly ask "why" is early childhood. Thus, option B is correct.
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