Limiting to A and C:
A: of the other infections such as -- means there are a lot of other infections and the measles and yaws, the two diseases mentioned therein are just examples of many more such diseases. This is far-fetched and not the intended meaning. The intended idea is to refer to just two diseases that are very similar to smallpox. To refer to a wide gamut of diseases will be too outside the scope of reference as Karishma has pointed out
C: Of such infections as— here, the scope
...
A: of the other infections such as -- means there are a lot of other infections and the measles and yaws, the two diseases mentioned therein are just examples of many more such diseases. This is far-fetched and not the intended meaning. The intended idea is to refer to just two diseases that are very similar to smallpox. To refer to a wide gamut of diseases will be too outside the scope of reference as Karishma has pointed out
C: Of such infections as— here, the scope
...
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