Question

Models need to be changed when _______.

Answer 1

I think the correct answer from the choices listed above is option B. Models need to be changed when scientific understanding changes. This should be done since the assumptions where the models are based on are changed. Hope this answers the question.

Answer 2

Correct answer: B.) Scientific understanding changes.  

The scientific models need to be changed whenever it is proved to be wrong by the discovery of the new evidence and with the better scientific understanding. With the change in scientific understanding the models need to be changed as the models are based on the assumptions,  which may be outdated with better understanding of the science.

Hence, the correct answer would be option B.