Our world would be different because without the printing press we would have no books, so school would be different and probably more difficult. Without the printing press we never would have printed bibles so church and any religious studies would be different (and probably more difficult) AND of course we would have no newspapers so there would be less advertising, and nothing to read on Sunday morning.
A thesaurus is a book of synonyms.
The answer that fits the blank given is RECOGNITION OF. Therefore, you can say that true appreciation is present when there is thoughtful observation, knowledge of the subject and the recognition of value because once a value is recognized, this when you say that the appreciation is done genuinely. Answer is C.