Final answer:
The scientist who discovered electron shells and worked on the Manhattan Project was Niels Bohr. Alan Turing was responsible for building the Enigma decoding machine, while Werner Heisenberg worked on quantum mechanics but was not part of the Manhattan Project.
Thus option c) Niels Bohr.is correct answer.
Step-by-step explanation:
The scientist who worked on the Manhattan Project and discovered electron shells was Niels Bohr. Bohr made significant contributions to the field of atomic structure and quantum theory, and he suggested that electrons in an atom were restricted to specific orbits, having only certain energies. His work was crucial to the development of atomic physics. During World War II, Niels Bohr was part of the team of scientists working on the Manhattan Project, the United States-led endeavor which succeeded in developing the first atomic bombs.
As for the scientist mainly responsible for building the Enigma decoding machine, the correct answer is Alan Turing. Turing's brilliance in code-breaking significantly contributed to the Allied victory in World War II. Meanwhile, Werner Heisenberg was a key figure in the development of quantum mechanics and received the Nobel Prize for his work in 1932; however, he remained in Germany during World War II and was not involved with the Manhattan Project, but rather the German atomic bomb effort.
J. Robert Oppenheimer is often called the "father of the atomic bomb" for his leadership of the Manhattan Project, but he did not discover electron shells, nor did he develop the Enigma decoding machine, which are mentioned in the provided materials.
Thus option c) Niels Bohr.is correct answer.