Reverse alphabetical sorting of a word

To solve this problem, we first need to count the frequency of each letter in the word "INCOMPREHENSIBILITIES" and then arrange them in reverse alphabetical order. The original word has the following letters and their counts:

Arranging these letters in reverse alphabetical order gives us:

Now we can compare the original positions of the letters with their new positions in the reverse-sorted order to find any unchanged positions. After analyzing the positions, we find that there are two letters that remain in the same position: the two 'I's in the original word are still in the same position in the reverse-sorted order.

Therefore, the answer is (c).