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While manufacturing has led to increased pollution levels, population growth has had an even stronger effect. By 2012, the population of Beijing rose to 20 million citizens. Which phrase from the excerpt indicates a transition? The amount of smog in Beijing . . . While manufacturing has led to . . . . . . population growth has had

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Answer:

The correct answer is letter "B": While manufacturing has led to...

Explanation:

Transition phrases are "parts of speech" used to help the reader understand how and idea is connected to other within the same text. They also, introduce a new idea of the same topic that is being discussed.

In the example, by saying "While manufacturing has led to..." the author explicitly lets the reader know that a new idea is going to be discussed on the same matter.