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IELTS Speaking Part 2 expects descriptive, extended responses. Option B provides time, location, and activity, using varied vocabulary. Cambridge Speaking scoring highlights coherence and elaboration.

The key phrase “still dominate” means fossil fuels remain the primary source. IELTS Reading often requires identifying the balance between two contrasting elements. Cambridge Reading criteria stress recognizing main trends.

IELTS Writing requires candidates to use a variety of sentence structures. Option B uses a concessive clause, improving grammatical range. Cambridge descriptors reward complexity and accuracy.

Academic writing must avoid slang (“kids,” “cool”). Option B uses formal tone, descriptive vocabulary, and clear structure. Cambridge and IDP IELTS descriptors require academic style for higher bands.

In IELTS Writing Task 1, the overview is crucial for achieving Band 6 and above. The question asks for the main trend rather than specific numbers. Option B correctly captures the overall trend: rapid initial growth followed by stabilization. Other options misrepresent the data. Cambridge IELTS guidance stresses that the overview should summarize the biggest trend without excessive details. IDP IELTS examiners look for phrases like “overall,” “in general,” and “it is clear that,” which indicate the candidate is providing a holistic summary. Strong overviews demonstrate the candidate’s ability to interpret data effectively, which is a key criterion for task achievement.