Comparative income statements for Tudor Retailing Company for the last two months are presented below: 
Which of the following classifications best describes the behavior of shipping expense?
Definitions:
Bipolar Disorder
An emotional health issue distinguished by significant mood oscillations, ranging from high (mania or hypomania) to low (depression) states.
Manic
Refers to an abnormally elevated mood state, which may include symptoms like increased activity, energy levels, or euphoria, often seen in bipolar disorder.
Depression
A psychiatric disorder characterized by a lasting feeling of depression or a disinterest in engaging in activities, significantly altering day-to-day life.
Seasonal Affective Disorder
A type of depression that occurs at a specific time of year, usually in the winter, when there is less natural sunlight.
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