Your Little Sister,who Is 14 Years Old,has Been Extremely Emotional

Your little sister,who is 14 years old,has been extremely emotional lately.Her mood changes very abruptly.Although you know that there are many changes that are taking place during this time,to what do scholars who study adolescence attribute this variability of emotional responses?

A) biological and physical factors
B) hormonal and endocrine factors
C) cognitive and environmental factors
D) emotional and psychological factors