请教一道问题

13. F: We ought not to test the safety of new drugs on sentient animals,

      such as dogs and rabbits. Our benefit means their pain, and they are equal

      to us in the capacity to feel pain.

      G: We must carry out such tests; otherwise, we would irresponsibly

      sacrifice the human lives that could have been saved by the drugs.

Which of

      the following, if true, is the best objection that could be made from F's

      point of view to counter G's point?

      (A) Even though it is not necessary for people to use cosmetics, cosmetics

      are also being tested on sentient animals.

      (B) Medical science already has at its disposal a great number of drugs

      and other treatments for serious illnesses.

      (C) It is not possible to obtain scientifically adequate results by

      testing drugs in the test tube,without making tests on living tissue.

      (D) Some of the drugs to be tested would save human beings from great pain

      (E) Many tests now performed on sentient animals can be performed equally

      well on fertilized chicken eggs that are at avery early stage of

      development.

谢谢，不知为什么，我再读一次忽然就明白了