Correct option is B
The correct substitution of the highlighted words is (b)
nothing else.
Explanation: The phrase “nothing” is correctly and commonly substituted with “nothing else” when we mean “only this and not something different.”
Example: His anger is nothing else but jealousy.
Grammatical rule used:
This structure emphasizes exclusivity: “nothing else but X = only X.”
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Information Booster: “Nothing but” and “nothing else” are idiomatic expressions meaning just/only that thing.