The type of hook that is being used is A. call to action
This refers to the type of line that is used to draw the attention of a person to something to convince or persuade the person to take action.
Hence, we can see that from the given statement, the speaker makes use of a hook to convince the mayor to adopt a citywide recycling program and by the mention of the under-use of recycled products, he employs a call to action
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