Correct option is D
Given word: CONSTABLE
Logic:
We check which option can be formed using only the letters of CONSTABLE, without adding or removing any letter.
Explanation:
CONSTABLE → C O N S T A B L E
Option D) OBSTACLE → O B S T A C L E
All letters match exactly with CONSTABLE.
Other options contain extra letters or missing letters.
Thus, correct option is (D) OBSTACLE.