Answer:
C). It ties the essay together and tell readers what they have learned and should remember.
Step-by-step explanation:
An informative essay is described as an essay inclined towards informing the readers about a specific topic, subject, or process. Since the aim is to inform the readers the conclusion must contain a 'wrap-up' of the entire content as it reminds the audience of the key ideas discussed with a sight of closure. Thus, the conclusion of an informative essay about a turning point must "ties the essay together and tell readers what they have learned and should remember" as the conclusion is something that leaves the readers with a takeaway. Thus, option C is the correct answer.