The answer is d. I hope that this was helpful
Ernest Rutherford contributed to the atomic theory by discovering that the atom is mostly empty space.
He can to that conclusion because he fired alpha particles at gold foil, which was so thin that it was only around .00004 cm thick, and while almost all shot straight through, some actually bounced back!
He likened it to shooting a 15-inch round(bullet) at tissue paper, only to have it bounce right back at you! Based on this, he theorized that the atom is mostly empty, which is why a majority of the particles passed right through, but in the very center of the atom there is a super-dense structure called a nucleus that held a majority of the atom's mass. This super-dense mass would be more than massive enough to deflect the particle, should they collide.
Answer:
The Monroe doctrine stated that the U.S. should use military force to prevent any form of intervention from an European power in the western hemisphere.
The Roosevelt corollary was different in that it allowed European powers to intervene as long as the intervention was considered justified, but not to invade.
This difference became clear during the Venezuelan crisis of 1902-1903, when Germany, Britain, and Italy imposed a naval blockade on Venezuela because the Venezuela president refused to pay for the damages suffered by European citizens during the recent civil war.
At first, Theodore Roosevelt allowed the blockade to continue because he believed that it was justified, but when Germany threatened to invade Venezuela, he intervened sending a fleet under Admiral George Dewey.
