Select the most appropriate option to fill in blank number 4.
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 i.e. careful.
Context: This part is giving advice on how speech should be used. A word that shows caution or precision is needed.
Analysis of the given options:
Firm: Not contextually fitting.
Attentive: Applies to listening, not speech use.
Careful: it fits well in the blank
Serious: Too general.
Correct word: Careful
Reason: The sentence is warning about misunderstandings, so "careful handling" fits.
Hence, the chosen option is correct.