Select the most appropriate option to fill in blank no. 4.
Show answer & explanation
Correct answer: B
Explanation
The correct answer is option 2, i.e. “of.”
In the phrase “affect the risk (4) spreading infectious disease,” the grammatically correct preposition is “of.” The resulting phrase, “risk of spreading infectious disease,” is a standard expression that conveys potential or likelihood, as seen in public health contexts. For instance, the CDC note on microbial risks states 'risk of infection' to describe the chance of disease transmission .
Therefore, the sentence should read:
Personal hygiene and household cleanliness practices affect the risk of spreading infectious disease.