Some questions fall outside the realm of science; which of the following questions could not be answered using the scientific method?

a. What is the function of the appendix in human beings?

b. Why is it unethical to test newly developed drugs in animals?

c. Why do smokers develop lung cancer more frequently than nonsmokers?

d. Why is it so difficult to quit smoking?

The correct answer is - option B.

Explanation:

Scientific method is the method that is based on sequenced scientific logic based steps to answer questions. Such questions are known as scientific questions that can be answered by the logic and not based on the believes or social norms.

The options provided with the questions are easily answer by the logic and scientific method by the knowledge except the option B that deal with ethical and unethical phenomena which is not depend on scientific knowledge.

Thus, the correct answer is option B.