Two arginine requiring mutants arg-4 and arg-5 were isolated in Neurospora. When the strains were grown alone on media without arginine they do not grow. When they were crossed to each other, the diploid F1 could grow in the absence of arginine. The table below shows whether mutants grow with the media supplemented with ornithine or citrulline or arginine. Media Supplement. Citrulline Ornithine Arginine Mutant arg-5 + arg-4 Explain the results. Choose the best answer. Select one: O A. the arg-4 strain likely carries mutations in 2 genes O B. arg-4 and arg-5 mutations are in different genes O C. arg-4 and arg-5 must have the identical mutation D. arg-5 mutations are dominant O E. arg-4 and arg-5 mutations are in the same gene