Firms that fail to invest in sustainable energy sources will face ---- penalties under the strict revised emissions directive.
Answer and explanation
Correct answer: D. substantial
- Step 1: The emissions directive is described as 'strict', meaning regulatory consequences will be significant in scale.
- Step 2: 'Substantial' means of considerable importance, size, or worth.
Answer
substantial.
Why not the others: 'Superficial' means shallow or minor; 'Compatible' means able to coexist; 'Precarious' means uncertain or perilous.
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