The best option for the effectiveness of the author's claim is C. It is effectively supported because the author twice notes how Vladimir Putin sees Ukraine's potential entry to NATO as a direct threat.
What are Putin's views on Ukraine joining NATO?
Putin says that Ukraine joining NATO will be a hostile act which means that he views it as a direct threat to Russia.
This is most likely because NATO will then be quite close to the borders of Russia which means that they could easily launch an invasion if things came to that.
In conclusion, option C is correct.
Find out more on the Vladimir Putin at https://brainly.com/question/525897.
