Read this excerpt. Which statement best summarizes the excerpt?
A The United States felt it was important to build an atomic bomb to use during World War II.
B Scientists in Europe succeeded in building the atomic bomb and asked the United States to fund further research.
C Scientists at the time were skeptical of the idea that nuclear fission could be used to build weapons.
D The United States started to build an atomic bomb because scientists were afraid the Germans would do it first.