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I was hesitant to pick E because it says "new acceptable way" and there's nothing that indicates that this new method is more acceptable than the old

please answer

Would appreciate an explanation of the question. Thank you!

In the passage, we are told that companies are working to develop safety tests using human cells, that, if successful, will reduce the need for animal testing. This clearly indicates that the managers believe that the human cell option is superior to animal testing in some way, and that the improvement is worth the investment in the new test. We dont know in what ways its better- it could be cheaper, it could be better from a PR prospective, or some combination of the two. Regardless, they must view it as net better to use the new human testing. While we do not know for sure that the human cell tests are acceptable yet, we can safely assume that they will only be adopted if they are.