Select the most appropriate option to fill in blank number 3.
Show answer & explanation
Correct answer: D
Explanation
The correct answer is option 4 i.e. to.
Context: The sentence is talking about how obese children, when they grow up, will be more prone (more likely) to experience certain health issues.
Correct word: To
Reason: The word “prone” (meaning likely or susceptible to) is always followed by the preposition “to” when introducing the condition or issue one is susceptible to.
Hence, the chosen option will be correct.