A major obstacle to developing good human relations skills is that people fear of taking risks.
Evidence from the passage and from your own point of view also support your reasons I hope I was helpful if not I am truly sorry.
Answer:
The correct answer is theory.
Explanation:
A theory is a scientific postulate that can be proved through experiments and the data that comes from them. Nevertheless, theories are always open and susceptible for change, because they are not an absolute truth and further experiments can lead to different conclusions.