Concept:The word "superior" is an absolute adjective and is not compared using more or most.
Explanation:The sentence compares the material used for my dress with the material used for yours.
In English, "superior" already carries the meaning of being higher in quality or rank.
Therefore, it cannot be modified by "more" or "most".
Forms such as "more superior" and "most superior" are grammatically incorrect.
The intensifier "very superior" is also inappropriate in standard usage for this comparison.
We simply use "superior" followed by "to" when making a comparison: "is superior to yours".
Thus, the blank must be filled with "superior".
Option C is the correct choice.
Answer:C. superior