4) B

The main conclusion of the paragraph is “If you make extra demand…only fossil fuels…can provide the extra capacity”.

A – Wrong
We can infer this but it is not the main conclusion of the passage as the UK grid is not the main focus of the text.

B – Correct
This statement correctly paraphrases the conclusion of the text.

C – Wrong
Wind power is not the main focus, so it cannot be the conclusion of the text.

D – Wrong
We cannot infer this from the information given to us.

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