The English physician Edward Jenner found that if
experimental subjects were deliberately infected with
cowpox, which caused only a mild illness, they are
immune from smallpox.
(A) which caused only a mild illness, they are
immune from
B) causing only a mild illness, they become immune
from
(C) which causes only a mild illness, they are
immune to
(D) causing only a mild illness, they became immune
from
(E) which caused only a mild illness, they would
become immune to
I have understood that 'E' is the correct answer.
However, I am not sure of the below comment in OG-
Th participle causing suggests that infecting
the subjects with cowpox caused a mild
illness only in some of the casesCan you please elaborate on the above remark?
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