Explanation:

Correct Answer is (c).The original sentence is incorrect.
Reason: When two singular subjects are connected using ‘and’ but refer to the same person, the singular form of the verb should be used. In the given sentence, ‘the singer and dancer’ refers to the same person and should be followed by singular form of the ‘be’ verb. Therefore, the ‘has’ should be used in place of ‘have’ so as to make the sentence correct.
Among the given choices option C replaces the bold part most appropriately.
The sentence after replacement becomes:
The singer and dancer has given a wonderful performance which calls for a standing ovation.Option C is hence the correct answer.