The correct answer is upset.
Discombobulate
A. dismantle
B. burst into flame
C. disengage
D. upset
The correct answer is (D) To upset; disconcert; confuse, frustrate.
The origin of discombobulate is uncertain.
Examples of use:
- Her plans were discombobulated by the new development.
- The crash discombobulated the tranquil atmosphere.