The key to this answer is the word ‘however’ at the beginning of option (c). This word marks the shift in the author’s tone from appreciation of the government’s decision to an observation of possible outcomes of this decision. Option (a) looks close, but it brings in the concept of legal certainty in environmental regulations. The precedent to ’This’ in the beginning of the sentence is also not very clear. The passage is applauding a certain decision. Option (a) seems to be an abrupt shift as it says that this indicates that we need to establish legal certainty in regulations. There are no grounds in the passage on which we can base this assertion. Option (d) presents a very bleak picture and is inconsistent with the flow of the paragraph. Option (b) brings up an altogether different issue - that of media attention. The word “sensational’ in this option is too far-fetched.