Given a text T, and several options, according to the question posed in the text T to choose the most appropriate option from the options as the answer, please directly output the most appropriate option, do not need to output the explanation.

The most likely argument against high national debt levels is that:
Option A:the debt is owed internally to fellow citizens.
Option B:they create disincentives for economic activity.
Option C:they may finance investment in physical and human capital.

Answer: B