Calvin Works at a Paper Manufacturing Company

Multiple Choice

Calvin works at a paper manufacturing company. The bleaching agents used by the company are toxic in nature and as a result of being exposed to these substances, Calvin has been experiencing intense depressive episodes due to changes in his brain functioning. From the available information, it would be most accurate to conclude that _____causes are responsible for Calvin's depression.

A) supernatural
B) biological
C) mystical
D) sociocultural