Correct option is C
Option (c) contains an error.
Explanation: The adjective "superior" does not require the word "than" for comparison. Instead, "to" should be used.
The correct phrase is "superior to."
Grammatical rule used: In comparative sentences using adjectives like "superior," "inferior," "junior," and "senior," the preposition "to" is used instead of "than."
Example:
· Incorrect: He is superior than his colleagues.
· Correct: He is superior to his colleagues.