Answer and explanation

Correct answer: C. The new prototype is neither cost-effective nor environmentally sustainable

  1. Step 1: Standard English grammar mandates pairing 'neither' strictly with 'nor' (and 'either' with 'or'). Answer: The new prototype is neither cost-effective nor environmentally sustainable. Why not the others: 'neither ... or' is an incorrect pairing, 'either ... nor' mixes affirmative and negative pairs, and 'both ... or' is ungrammatical.

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