Indian Institute of Foreign Trade 2017 Solved Paper

Choice (B)
Fret (v): be constantly or visibly anxious. For example: "She fretted about the cost of groceries"
Disquietude (N): a state of uneasiness or anxiety.
For Example: "Such passages reflect a sense of disquietude, of alienation even"
Thus, disquietude is result of fretting, In the same manner inspirit (encourage or enliven) will gives rise to confidence.