Step 1: Analyze the sentence.
The sentence states: "The statue of Christ the Redeemer is located on Rio de Janeiro, the largest city of Brazil." The preposition "on" is incorrectly used in this context, as the statue is located in the city, not on the city. The correct preposition should be "in."
Step 2: Analyze the options.
- (a) "on Rio de Janeiro" is incorrect because we typically say "in Rio de Janeiro" when referring to being located within a city.
- (b) "The statue of Christ the Redeemer" is grammatically correct.
- (c) "is located" is grammatically correct.
- (d) "the largest city of Brazil" is grammatically correct.
Step 3: Conclusion.
Thus, the incorrect part of the sentence is "on Rio de Janeiro," and the correct answer is (a).