What made Allied leaders worry about the cost of invading the Japanese mainland? kamikaze fighters machine guns atomic bombs warplanes

kamikaze fighters

Explanation:

The term kamikaze of Japanese origin, was originally used by the American translators to refer to the attacks made by pilots of a special unit belonging to the Imperial Japanese Navy against vessels of the Allied fleet at the end of the Second World War. These attacks aimed to stop the advance of the allies in the Pacific Ocean and prevent them from reaching the Japanese coasts. To this end, airplanes loaded with bombs of 250 kilograms deliberately struck against their targets with the desire to sink or damage them so badly that they could not return to battle.

answer is B. Kamikaze fighters