Respuesta :
Because the first bomb did not lead to a Japanese surrender to the United States.
American scientists started to develop a superbomb in the year 1942 as they didn't want the country of Germany to develop it at the earliest.
Option D is correct.
What was Hiroshima and Nagasaki attack?
The atomic bombing attack was initiated over the states of japan called Hiroshima and Nagasaki in the year 1945.
The super bomb was dropped over the Nagasaki state just after the time span of three days of creating an attack on the Hiroshima state of Japan in order to induce the Japanese to got surrendered itself and also wanted to killed many of citizens living there.
Questions' missing part:
The options are as follows:
A) The United States planned to attack the Soviet Union after the war.
B) Roosevelt was planning an attack on Hiroshima and Nagasaki.
C) Japan was working on a similar weapon.
D) They didn't want the Germans to develop one first.
Therefore, the superbomb being developed by scientists of America in 1942.
Learn more about the Hiroshima and Nagasaki attack in the related link:
https://brainly.com/question/17095130
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