Answer: E) separation of powers
Step-by-step explanation:
The Line-item veto is a provision that allows an Executive authority such as a Governor or the President to cancel out parts of a bill enacted by Congress without having to veto the whole thing. Essentially it is a partial veto power that allows them to veto a bill only in part should they please.
Governors in 45 US States have this right but the President of the United States does not.
It is argued that this provision violates the principle of Separation of Powers amongst the Judiciary, the Legislature and the Executive.
This is because the Legislature should have exclusive power to construct the inner texts of a bill and the Executive should not be able to alter this content.