The success rate for smokers quitting on their own is about 5% after one year in the United Kingdom, thus the closest answer choice is 10%. It highlights the difficulty in overcoming nicotine addiction despite the desire to quit.
The percentage of people who stop smoking altogether through self-change or natural recovery is relatively low. Based on the information provided, in the United Kingdom, even though half of the smokers try to quit each year, only about 5 percent are successful in not smoking a year later. While there is a desire to quit among a considerable number of smokers, the challenges of overcoming addiction to nicotine prove significant for many.
In conclusion, given the options provided and the information about quitting success rates, the most accurate estimate for the percentage of people who stop smoking altogether by self-change or natural recovery would be 10% (Option A).