Answer: adjective
Explanation:
The word class that the word in bracket underlined word in the sentence belong to is the adjective.
The adjective is used to modify a noun and give more information about it. Special as used in the sentence means that the pen or brush us used for something different and particularly designed for a unique purpose.
T<span>he correct transition word to complete the sentence is although. This is a conjunction which also means the same as even if and despite of. As used in the sentence above, it means that even if the cheerleading squad have practiced their routine, their performance is still not enough to impress an audience.</span>
I think it is c
Hope this helps