I believe your answer is A because almost all people with knowledge know that grass is green. Someone would only ask this if they weren't for sure, such as someone being color blind. Hope this helped!
Thanks!
~Steve
I would actually use them together: benefit from someone's expertise.
For example,: While building this bridge, we could benefit from the architect's expertise.
or:
Let's invite Sarah, she knows a lot about cooking, we could benefit from her expertise!
