What expense category do pens come under?

This is a difficult question to answer, as pens can be used for a variety of purposes. However, we believe that the most likely expense category for pens is "Office Supplies". This is because pens are generally used for writing and taking notes, both of which are common office activities.

Of course, there are other possible expense categories for pens, depending on how they are being used. For example, if pens are being given away as promotional items, they would fall under the category of "Marketing Expenses".

In short, the answer to this question depends on the specific circumstances under which the pens are being used. However, we believe that "Office Supplies" is the most likely expense category for pens.