Why might balancing federal and state powers present a problem?

I believe that this is a multiple choice question and the choices are as follows:

A) The Constitution does not address how to handle conflicts between state and federal powers. 
B) People have different opinions on whether state or federal government should have power to control certain issues.
C) The federal government does not believe states are responsible enough for concurrent powers. 
D) The balance applies only to implied powers, which are often open to misinterpretation.

People have different opinions on who should have power to control issues such as whether to leave certain things up to the state and this could cause havoc among those trying to decide who should get what power to keep each other in check.

Therefore your answer is: B) People have different opinions on whether state or federal government should have power to control certain issues.