The author in this passage has tried to focus on

Concept — A “what has the author focused on” question asks for the dominant mode of treatment a writer adopts, not for the subject being written about. Four modes are commonly distinguished: extending knowledge (adding fresh information for its own sake), generating consciousness (urging a change of attitude), analytical reasoning (setting a stated claim against evidence and drawing a conclusion from that comparison), and describing (reporting conditions as they stand). The mode is identified from how the passage moves, not from what it happens to be about.

Application — how this passage moves

1. It opens by stating a popular view: that the growth of towns and cities in developing countries connotes environmental degradation, slums and squatters, urban poverty, unemployment, crime, lawlessness and traffic chaos.

2. It then turns on that view with a direct challenge — “But what is the reality?” — which sets up a comparison instead of continuing a report.

3. It answers that challenge with an evaluative thesis stated up front: given the rise in urban population in developing countries from 300 million in 1950 to 2 billion in 2000, “the wonder really is how well the world has coped, and not how badly”.

4. It then supplies evidence for that thesis: urban quality of life improved in water and sanitation, power, health and education, communication and transport, illustrated by China, India, Indonesia and the Philippines, with sanitation services alone reaching an additional 293 million citizens between 1990 and 2000.

5. It qualifies its own evidence rather than letting it stand — access to improved water fell as a percentage of the total urban population during the last decade of the 20th century even while the absolute number of urbanites served rose — and closes by requiring these gains to be viewed against rapidly increasing urban population, fiscal crunch and strained human resources.

Cross-check — claim → counter-question → thesis → supporting evidence → self-qualification → contextual evaluation is the signature movement of analysis, so what the author focuses on is Analytical Reasoning.

Contrast with the near misses

• Extension of Knowledge: the figures are recruited to defend a thesis the author has already stated; they are not offered as new information for its own sake.

• Generation of Environmental Consciousness: environmental degradation appears once, inside the list of popular perceptions the author goes on to weigh, and no appeal for ecological awareness follows it.

• Descriptive Statement: pure description would report the water, sanitation and population figures without the “But what is the reality?” turn, without a thesis to defend, and without the percentage-versus-absolute qualification — all three of which this passage carries.