Correct Answer: TAPED

Solution : Given:
BASTIONED

Let's compare all the option words with the given word.
First option: BANDS; All the letters of BANDS are present in the word BASTIONED.
Second option: BONES; All the letters of BONES are present in the word BASTIONED.
Third option: TONED; All the letters of TONED are present in the word BASTIONED.
Fourth option: TAPED; P is not present in the word BASTIONED. Therefore, all the letters of TAPED are not present in the word BASTIONED.

Only TAPED cannot be formed using the letters of BASTIONED . Hence, the fourth option is correct.