Question

Fill in the blank with the most appropriate word.
It's wise to be careful ______ one's health.

• A. to
• B. by
• C. of
• D. at

Answer 1

Answer: (C)

of

Option C is the correct answer because 'of' is used to mean concerning something or somebody, 'one's health' in the given context.

Options A, B and C are incorrect because 'to' is used to mean in the direction of something or towards something, 'by' is used to indicate proximity or agency and 'at' is used to indicate a specific location or a specific time.