Answer:
You did not list your counrty but .Vaccines are the best way we have to prevent infectious disease. A successful immunization program depends on the cooperation of every person. Vaccinations prevent you or your child from getting diseases for which there are often no medical treatments. These illnesses can result in serious complications and even death.
Explanation:
The answer is C.) because of the present participle "has". If the present participle "has" wasn't in the sentence, then the answer would be B.). Anyway, the answer is C.) because of "has". (has spoken). I hope that helps :)
Answer:
I will always study my lessons