Ralph loves his birthday, but he tends to eat too much throughout the day. At the level, there may be hormonal reasons why Ralph is prone to overeating. At the level, it is hard for Ralph to turn down second helpings when his friends keep buying him meals.

Correct answer is "biological & social"

Explanation:

Human psychology states that the human is full of desires and emotions and hopes by which the person should be change in life.In biological level, when human is prone to overeating the hormones mechanism disturbed and the health is going to unwell.this is the reason the Ralph is prone to overeating.At the social level person wants to help someone and try to laugh all in the world, show the nature of a person in which the life should be easy or accurate because of social awareness and humanity in the world. so, Ralph turn down second helpings of his friends.Hence the correct answer is "biological & social"