Final answer:
The minor party among the choices provided that has never been active in the United States is the 'Bull Moose Reform'. Other parties like the Bull Moose, Reform, Green, and Conservative have all been active at some point in U.S. history.
Step-by-step explanation:
The student has asked about a minor political party that has never been active in the United States. Among the options provided, 1) Bull Moose, 3) Reform, 4) Green, and 5) Conservative have all been active as third or minor parties at various times in U.S. history. The Progressive Party, also known as the Bull Moose Party, was a third party active during Teddy Roosevelt's campaign in 1912, the Reform Party was founded by Ross Perot in the 1990s, the Green Party has been active since the 1980s, and various conservative parties have existed, including the historic Conservative Party. Therefore, by the process of elimination and considering historical records, the correct answer is that 2) Bull Moose Reform has never been an active political party in the United States.