The correct answer is: C. degrade
The non-cooperative attitude of the members can only degrade the image of the society. This is because when members do not cooperate, it creates a sense of disunity and chaos. This can make the society look bad to outsiders and can also make it difficult for the society to function effectively.
Option A, “spoil,” is incorrect because it does not accurately reflect the negative impact that non-cooperation can have on a society. Option B, “improve,” is incorrect because it is the opposite of the correct answer. Option D, “defame,” is incorrect because it is too strong of a word to describe the impact of non-cooperation.
In conclusion, the correct answer to the question “The non cooperative attitude of the members can only …… the image of the society” is: C. degrade.