According to Freud, behaviors such as smoking, chewing gum, and biting one's fingernails probably can be traced back to unmet needs during which psychosexual stage?

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According to Freud's psychosexual theory, behaviors such as smoking, chewing gum, and biting nails are oral fixations, stemming from unresolved conflicts during the oral stage (birth to 18 months) characterized by oral pleasure-seeking activities related to feeding and comfort.

According to Freud, Behaviors Such as Smoking, Chewing Gum, and Biting