Correct option is C
The correct substitution of the highlighted words is (c)
over the defeat.
Explanation: The phrase “disappointed
over the defeat” is correct because the preposition “over” is used to indicate the cause of disappointment or emotional reaction.
Grammatical rule used: Prepositions after adjectives depend on the emotion and object involved. "Disappointed" typically takes "over," "with," or "by," depending on the structure.
Example: She was disappointed
over the team's performance.
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Information Booster:
Use “disappointed
over” when the subject is reacting to a situation or event.
Use “disappointed
in” for people, and “with” for objects/choices.