Answer:
D
Step-by-step explanation:
It would be D because Bias is normally used to describe your opinions on something. "Personal" is a key word for the last option. As soon as you see it, it is a major sign that it is biased.
D. Discarding data that does not fit with your personal expectations.
This is changing the results of the experiment because it does not agree with your personal idea/opinion.
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