Select the most appropriate option to fill in blank number 4
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2 i.e. which.
Context: The clause gives additional information about smallpox and its effects.
Analysis of the given options:
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That: restrictive relative pronoun; but here the clause is non-restrictive.
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Which: used for non-restrictive relative clauses, which fits this context.
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When: refers to time—not suitable here.
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Who: used for people—not for a disease.
Correct word: Which
Reason: 'Smallpox' is being described, and the clause adds non-essential info about what it did.
Hence, the chosen option is correct.