The new policy turned out to be a double-edged sword.What does the underlined idiom mean?

Explanation

The idiom 'double-edged sword' refers to a situation or decision that has both positive and negative consequences. In the context of the new policy, it suggests that while there may be benefits, there are also potential drawbacks that should be considered. Option A is incorrect because it suggests the policy has no value at all, while Option C fails to capture the dual nature of the idiom and simply focuses on danger. Option D is also incorrect as it implies simplicity rather than the complex implications of the policy.