<u>Answer:</u>
Eradicating smallpox was successful because of many reasons.
<u>Explanation:</u>
Smallpox was regularly found in an area or we can say it was prevalent in some places. So, mortality rates were high. It was caused by variola virus and affected mainly humans. So, it was essential that such vaccine is developed which can successfully immune people from this disease.
Smallpox vaccine then started spreading across "Europe and North America" and then gradually it spread all over the world and successfully eradicated smallpox by 1980. Other diseases that have been controlled by vaccines are “diphtheria, bacterial influenza, measles, mumps, rubella, and tetanus”.
The correct answer among all the other choices is "The tone of work of fiction or nonfiction is influenced by sentence and word choice." Thank you for posting your question. I hope this answer helped you. Let me know if you need more help.
B persuasive writing because it has the word persuasive in it but it means to persuade someone about something
