Correct Answer: Excruciating

Solution : The correct answer is the second option.

"Harrowing" describes an experience that is extremely distressing, traumatic, or agonising. Similarly, "excruciating" also conveys the idea of intense pain, anguish, or suffering.

The meanings of other options are as follows:

• Exterminate means to destroy completely; to kill off or eliminate.
• Awesome means inspiring awe or admiration; extremely impressive or remarkable.
• Sad means feeling or showing sorrow or unhappiness; causing or characterised by grief or sorrow.

Therefore, the correct answer is excruciating.