Title: Secrets in a Letter.. Sentence 1: Albert Einstein has been working on some special science. Sentence 2: He's developed equations relating mass to energy. Sentence 3: He knows that this could lead to a powerful weapon. Sentence 4: He feels that the United States should develop such a weapon first. Choices: a. He describes his ideas in a letter to the President. b. Kim and the other employees helped clean up the store.
b