Concept:The correct spelling requires two 'c's and an 'i' inserted after the first 'a'.
Explanation:The correct spelling is: A c q u a i n t a n c e.
Option A, "Aquaintance", is missing the first 'c'.
Option B, "Acquantance", is missing an 'i' after 'q'.
Option D, "Acquaintence", wrongly replaces the final 'a' with an 'e'.
Only Option C, "Acquaintance", has all the letters in the correct order.
Answer:C. Acquaintance