what is self-esteem? a. a judgment of the value of the self b. a person's optimal patterns of thought, feelings, and actions c. a person's knowledge of his or her roles and memories d. a person's description of his or her own positive characteristics

Id say a.a judgment of the value of the self
i say this becuase its the closest thing that resembles the deffinitions of self-esteem which means "confidence in one's own worth or abilities; self-respect."
low self-esteem is when you DON'T respect yourself and have a lack of self confidence 
therefore ur answer is a :)