The constitution states that the executive power shall be vested in a prime minister a governor a president a senator

The correct answer is: the President

In the United States, the executive branch is led by the President of the United States.

no options provided, here,but the answer to this question is often: a historian cites a japanese newspaper article published a year after the end of world war ii in order to draw conclusions about the effect of the war on the japanese economy.

clearly from the answer, the historian alludes to historical sources,and records to aid in analyzing and drawing conclusion on the effect of the war on the economy of japan.