The sentence "The Neolithic Revolution led to increased food supplies" can be improved by including relevant facts. Option A is correct.
Relevant facts are important in an attempt to write an informative essay, in order to support and provide evidence that proves the information presented.
When writing the informative essay, it would be appropriate to make a list with the important facts and then, create an outline that will organize your facts in a logical way to write the essay based on the outline you've created.