In einstein’s letter to president roosevelt, he urged the president to
a. establish a policy of stockpile stewardship.
b. to develop the first atomic bomb.
c. to collaborate with the germans to develop the atomic bomb.
d. to develop an alternative weapon using uranium and petroleum.

B is the correct answer.

Known as the Szilard letter, Einstein signed onto a letter which encouraged FDR to develop American expertise on the atomic weapon issue.

B. To develop the first atomic bomb is the correct answer.

Explanation:

The Einstein- Szilard letter was written by Leo Szilard and signed by Albert Einstein. Szilard wrote this letter after consultations with fellow Hungarian physicists. These physicists warned Roosevelt of the threat that Germany could develop nuclear bombs and proposed that US must start working o n its own Nuclear program. The letter prompted Roosevelt for starting the Manhattan project that led to development of first Nuclear Bomb in US.