Answer:
C
Step-by-step explanation:
The correct answer is C, psychiatry. The word "depression" has multiple meanings, but in the sentence "The doctors determined that Sue's feelings of helplessness were due to depression, not to her recent injury," the word is referring to the mental disorder characterized by feelings of dejection and inadequacy. This is the definition of depression that is most commonly used in the field of psychiatry.
The other two meanings of the word "depression" are not relevant to the sentence. The meaning in medicine refers to an abnormal lowering of the rate of a physiological function, such as respiration. The meaning in meteorology refers to an area of low atmospheric pressure. Neither of these meanings is relevant to the sentence, which is about Sue's mental state.
Therefore, the word "depression" in the sentence is jargon specific to the field of psychiatry.