Final answer:
Children described as having a more negative mood, being easily frustrated, and slow to adapt to changes likely have a difficult temperament. Option b) is correct.
Step-by-step explanation:
Children with a generally more negative mood who are easily frustrated and slow to adapt to change most likely have a difficult temperament. Temperament, which includes inborn, genetically based personality differences, is evident from infancy.
A child with a difficult temperament is more likely to display negative emotions, struggle with adapting to change, and experience difficulty in regulating emotions. This may pose challenges for parents, teachers, and caregivers, as such children are more likely to elicit stronger reactions from adults.