The correct answer is D) the quote refers to implied powers, which are often difficult to interpret and understand.
The type of powers that this quote refers to, and why is this type often the source of debate is "the quote refers to implied powers, which are often difficult to interpret and understand."
The quote expresses that "Congress shall have power to make all laws which shall be necessary and proper for carrying into Execution the foregoing powers."
The implied powers are often difficult to interpret and understand because they are not explicitly stated in the Constitution, and that is why every state can understand whatever its bets for its interest.
The other options of the question were A) the quote refers to reserved powers, which are given to the states to interpret as they will. B) the quote refers to expressed powers which are not considered either "necessary or proper." C) the quote refers to concurrent powers, which are difficult to implement equally in every state.
