observations should be as detailed as possible, and remain...\nbiased.\nprejudiced.\nobjective.\nsubjective.

Brief Explanations:

Observations in academic and scientific contexts should be free from personal opinions or biases. Objectivity means presenting facts as they are without distortion by personal feelings or prejudices. Biased, prejudiced, and subjective observations are influenced by personal viewpoints, which is not ideal.

Answer:

C. objective