Answer:
The correct answer will be option-develop new methods to test the hypothesis.
Explanation:
The success rate of any biological experiment depends on the model organism the scientists use to examine the tests. The ideal model organism used should have certain features so that hypothesis can be verified like:
1. The life span of the organism: organism should have short to moderate life span.
2. Offspring number: the organism should produce a large number of offspring which reduces the chances of error.
In the given question to study the human disease, the scientist give up on human experiments as the life span of human is about 100 years with late reproductive phase so require a long time to record the observations. To avoid this the scientist will find alternative ways to test the designed hypothesis like performing experiments on the close relatives of humans like chimpanzee and mice.
Thus, the selected option is the correct answer.
