The logical answer is c provided that the "new, better idea" stand up to scrutiny under the scientific method.
Politics (b.) should never be a reason for changing scientific ideas.
Likewise, the fame of a particular scientist should have nothing to do with the modification of a scientific idea.
Science uses the scientific method and whether people are tired of old ideas or not is not a reason to change them.
It should be a food web, because there are various producers and consumers, and the bears and humans eat each other
Number 4 is not part of the cell theory
