Correct Answer: D
Explanation:
The words, ‘approach’, ‘stance’ and ‘outlook’ mean the same and placing either of them in the sentence will render the same meaning to the sentence. However, all these three words carry the same meaning as ‘attitude’ which is already present in the sentence. Therefore, D and E are the correct answers as ‘functioning’ and ‘operation’ also mean the same and fit in well with the meaning being conveyed by the remaining sentence.