_____ our friendly staff, you'll find our hotel provides everything you could ever desire.
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in addition
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in addition of
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in addition to
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in addition from
To solve this question, the user needs to understand the correct preposition to use after the phrase "in addition".
The correct preposition to use in this context is "to", making option C the correct answer.
Explanation of each option:
A. "In addition" can be used alone as a phrase, but it does not take the preposition "of". This option is incorrect.
B. "In addition of" is not a correct phrase in English. This option is incorrect.
C. "In addition to" is the correct phrase that indicates the addition of something to something else. This option is correct.
D. "In addition from" is not a correct phrase in English. This option is incorrect.
Therefore, the answer is: C. in addition to.
'In addition to' is the correct prepositional phrase meaning 'as well as' or 'along with,' used here to mean the hotel offers more beyond its friendly staff. 'In addition' alone is an adverbial phrase that needs a following preposition to connect to a noun phrase like 'our friendly staff,' so it's grammatically incomplete here. 'In addition of' and 'in addition from' are not standard English prepositional combinations — 'to' is the only correct preposition to follow 'in addition' when introducing a noun.