According to the text,some laughter in babies may actually be due to feelings of

A) sadness.
B) fear.
C) anger.
D) disgust.

Laughter

A bodily reaction, often spontaneous, consisting of rhythmical, often audible contractions of the diaphragm and other parts of the respiratory system.

Sadness

A natural emotional response to experiences of loss, disappointment, or other upsetting circumstances.

Fear

An emotional response to perceived threats or danger, triggering physiological changes geared towards avoidance or defense.