Choose the option that best completes the gap(s).
Vital ...... is still spread ..... word of mouth in most villages in Africa?
Vital ...... is still spread ..... word of mouth in most villages in Africa?
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Correct Answer: Option C
Explanation:
Vital information  is still spread by word of mouth in most villages in Africa?
By; is mostly used when referring to a means of something,
Vital information  is still spread by word of mouth in most villages in Africa?
By; is mostly used when referring to a means of something,