Answer:
The answer is option C) Sampling Bias
Step-by-step explanation:
A researcher who is conducting observations to test her own hypothesis may see or pay more attention to behavior that tends to support that hypothesis, so she must guard against observer bias
Observer bias is the tendency to allow how we feel or what we expect influence what we see.
As a researcher conducting observations to test her own hypothesis, it is possible that she may feel or think a certain way that will influence her observation.
knowledge of observation bias and how to guard against it will help her eliminate such error.