On Edg: Which scientist is often called the “father of the atomic bomb” because of his work as the head of the Manhattan Project? A. Enrico Fermi
B. Albert Einstein
C. Edward Teller
D. Robert Oppenheimer

Robert Oppenheimer is often called the "father of the atomic bomb"

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explanation:

roosevelt believed that in light of the country's recent military successes, it was unnecessary to use force to achieve foreign policy goals, so long as the military could threaten force. this belief, and his strategy of “speaking softly and carrying a big stick,” shaped much of roosevelt's foreign policy.