mdacosta , here you go:
C) The use of "known people" is problematic here. It seems to be saying that of all "known people" in the world, there are few who have recovered. Our focus should be on whether the recovery (not the people) is known.
D) This repeats the problem in C, but makes it worse by misplacing the end modifier at the beginning. Now we're saying that this only the case "after symptoms appear." In other words, once symptoms appear (in us, perhaps?), there
...
C) The use of "known people" is problematic here. It seems to be saying that of all "known people" in the world, there are few who have recovered. Our focus should be on whether the recovery (not the people) is known.
D) This repeats the problem in C, but makes it worse by misplacing the end modifier at the beginning. Now we're saying that this only the case "after symptoms appear." In other words, once symptoms appear (in us, perhaps?), there
...
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