PART B: Which detail from the text best supports the answer to Part A? A
“Before vaccines, many children suffered from debilitating — and killer — illnesses such as measles, polio, smallpox and diphtheria.” ( Paragraph 3)
B
“The body is designed to fight off foreign invaders, such as germs. To do this, it needs to be able to distinguish elements of itself from outside agents (nonself).” ( Paragraph 5)
C
“The antibodies ‘remember’ the germ. This creates immunity against future infections with the same type of germ.” ( Paragraph 12)
D
“Now the old antibodies may no longer recognize the new form of the germ (and antigens) and therefore fail to protect against it.” ( Paragraph 14)