According to Freud, an adult who considers the world a bitter place probably had difficulty during the ________stage of development.

Oral

A newborn's instincts are primarily centered around the mouth, which serves as the infant's primary source of pleasure-seeking. The mouth is essential for obtaining nourishment and satisfying hunger through feeding. During this stage, the infant experiences oral gratification through activities such as thumb sucking, biting, and babbling. It is during these early months of life that foundational emotional connections to the world are established. From Freud's perspective, an adult who perceives the world as a negative or unpleasant place may have encountered challenges during the oral stage of their development.