I am pretty sure the answer is B but correct me if I'm wrong hope this helps.
because the model makes the concepts easier to understand
Explanation:
A model would be useful because they make concepts easier to understand.
Models are abstractions of the real world.
- Scientists use model to make concepts easier to understand
- Models take parts of the real world and simulates them.
- They help remove the ambiguity that might be associated with studying the real world.
Learn more:
Model brainly.com/question/5012266
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Hectograms are 10^2, and centigrams are 10^-2, so converting from hg to cg would require 25 to be multiplied by 10^4. Thus, the answer is 250,000 centigrams.