大全上的问题（明白了）

lisiberry

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 a very early stage of development.


OA：E

请问一下，at one's disposal怎么翻译呀。明白了，由自己处置的意思。