Katherine Connor started her day with a cup of coffee while reading the newspaper. However, something about the day makes her feel low. When she reaches the office, she feels upset and distracted from work although she cannot pinpoint a reason for feeling this way. She continues to feel upset and distracted through the rest of the day. Which of the following is she most likely to be experiencing?A) a response
B) a reaction
C) a counteraction
D) an attitude
E) a mood

In psychology, mood is a state of emotion, a temper or a person's humor. When a person is suddenly affected by a certain mood due to external environment or internal problems or certain stimulus he or she feels low, distracted and upset. It an uneasy state, something which the person does not like or does not like to feel at ease.

Katherine Connor is certainly experiencing a mood which may be due to some stress or mild illness that she does not decipher, or it may be due an event or incident which she does not recall though involuntarily it has affected her. A negative mood can overpower a person with no apparent cause as well.