The word that most clearly describes a medium is, 'audiobook'.
What is medium?
Medium is a channel through which a speaker or a writer addresses their audience.
Because audiobook, is a medium that helps in better the communication between the two-party. Audiobook is a powerful communication medium that can influence a lot of people and helps in increasing reading accuracy and learning.
Hence the correct option is, D. 'Audiobook'
To know more about medium:
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