The best way to strengthen the argument is:
Sentence 4 should be revised to incorporate strong supporting evidence.
Below is the argument that actually completes the question.
(1) Universal health care should be adopted by every country around the world. (2) Over 100 million people become poor every year because of healthcare bills. (3) Imagine how it feels to be afraid to go to the doctor for fear of plunging into debt. (4) That is a really terrible thing, and governments need to act. (5) The World Health Organization (WHO) says that universal health care is achievable, even in poor countries. (6) The WHO recommends spreading the costs of health care across the population, so no one is overly burdened. (7) If a responsible organization like the WHO says it is possible, then worldwide governments should implement universal healthcare immediately.
An argument is known to be a statement or a paragraph one uses to convince an audience that your opinion or idea about something is correct.
In the above text given, we can see that writer didn't give enough supporting evidence to back up his argument.
In revising the argument in an effective way, it's important to add strong supporting evidence.
Learn more about an argument on https://brainly.com/question/540969
