Question

When conducting scientific research or experimentation, researchers carefully analyze and evaluate results to determine a valid conclusion. A scientist conducts an experiment to determine how different brands of fish food affect tropical fish growth. The scientist determines that all of their fish grow better when fed a specific brand of fish food. Why would it be important to question the results of this experiment?
a.
it may be incorrect
b.
it may be based on opinions
c.
information can be biased
d.
all of the above