According to Sigmund Freud, a dream is:

a. a person's unconscious desire that he/she wishes to fulfill.

b. a person's counter-life which he/she is unable to endure in the real world.

c. a piece of thought which has no coherent organization.

d. a problem that a person has not been able to solve during the day

a. a person's unconscious desire that he/she wishes to fulfill.

Explanation:

In psychology, the concept of the dream was proposed by a psychologist named Sigmund Freud and is described as a process through which an individual's unconscious desires and wishes are being exposed. Therefore, Sigmund Freud describes that an individual's dream consists of two distinct content or meaning including the manifest and the latent content.

Manifest content or meaning: It possesses the obvious meaning of a person's dream.

Latent content or meaning: It possesses the hidden meaning of a person's dream.