Sentence Correction (SC) | The growth of the railroads led to the abolition of local times, which

I knew the reason that determined is a modifier and should be parallel with modifier not with verb .but I was not not able to guess "differed from" is a verb. How to check that ?
the test I used to check it is a verb is place" differed from" closer to local times and see if any action is done. in my understanding there was no action and just a modifier. Went with D and my answer was wrong.