Answer:
The correct option is A.
Must be biased.
Step-by-step explanation:
A good scientific observation refer to the process of getting and receiving information from the outside world using the five senses and other scientific method.
A good scientific must be biased us not a characteristics of scientific observation because been biased will not give the accurate , detailed, precise and real information about the data or information.
Been biased will limit what the truth knowledge is and it will give space for passing and receiving false information about the subject matter.
There should be accuracy and real truth in good scientific observation.