Under your experimental conditions, you find that your mutants quickly ... ...

Under your experimental conditions, you find that your mutants quickly die out after a few generations. However, when you culture them without drugs they typically do well. Which of the following mutants would probably die off more quickly than the others under your experimental conditions?
(A) 1
(B) ...
(C) ...
(D) ...
(E) ...

*This question is included in 12. Mitosis