To solve this question, let's first determine the arrangement of the letters in the word "BINDER" when sorted in English alphabetical order.
Step 1: Arrange the letters in alphabetical order
The letters in "BINDER" are:
B, I, N, D, E, R
In alphabetical order: B, D, E, I, N, R
Step 2: Compare the positions of letters
Now compare the original positions of the letters in "BINDER" with their positions in the alphabetically sorted sequence:
1) B → Remains at position 1 (unchanged).
2) I → Moves from position 2 to position 4 (changed).
3) N → Moves from position 3 to position 5 (changed).
4) D → Moves from position 4 to position 2 (changed).
5) E → Moves from position 5 to position 3 (changed).
6) R → Remains at position 6 (unchanged).
Step 3: Count unchanged positions
· Letter B (position 1) and letter R (position 6) remain in the same positions.
so
Two letters remain unchanged.
option (c) is the correct answer.