Explain why a hypothesis has to be written objectively?

the principles and empirical processes of discovery and demonstration considered characteristic of or necessary for scientific investigation, generally involving the observation of phenomena, the formulation of a hypothesis concerning the phenomena, experimentation to test the hypothesis, and development of a conclusion that confirms, rejects, or modifies the hypothesis.

im not intirely sure but i think the anwser is d relative humidity

if you listed your answers right then i believe your answer is b.