D is the answer to this question. This comes from the theory created by Sigmund Freud, which he called Psychoanalysis. This is composed of different stages wherein the child starts to discover more about himself. The phallic stage is the third stage of development.
This is the time when the erogenous zone of the infant is his genitalia. Take note that the pleasure zone may change depending on the age or the stage that the infant is going through. Some adults may never get over this stage until they reach adulthood, wherein they may develop some abnormal mannerisms and habits because they were not able to satisfy their wants when they were younger.
The answer to this is phallic stage. It is during the phallic stage that the child tries to seek sexual pleasure. The phallic stage is actually the third stage of psychosexual development. This is a theory that is created by Sigmund Freud whom a lot of people consider to be one of the people who made it possible for the mind to be more understood.
The Phallic stage is said to occur when the child is about 3 to 6 years old. The libido of children may change depending on the age that they are in. During this time, it is the genitalia that is the center of attention. The libido may be directed towards different parts of the body during the other stages.