The correct answer is C) Each branch has the ability to limit the powers of the others.
This system was put in place with the US Constitution to prevent one branch of the government from gaining too much power. The three different branches of the government can be checked by each other. For example, the executive branch (aka the president) has the ability to veto an law passed by Congress. This veto prevents the bill from becoming a law. However, Congress has the ability to override the veto of the president if they get a 2/3rd majority vote in legislative branch (aka Congress). This shows that different branches of the government can continually check each others power,.
The US has had the leading economy since it has a controlled economy and it manages its money but the US's economy is going to start going down if they don't stop wasting/spending money.