The type of interest group that is most likely to protest the expansion of oil pipelines in the United States is the Citizens.
By expanding the pipelines in the United States, the pipelines would extend across many neighborhoods, thereby creating potential dangers to the citizens.
Expansion of oil pipelines in the neighborhood of average citizens might increase neighborhood dangers, such as danger to water distribution, pipeline burst, fire explosion, etc.
Hence, in this case, it is concluded that the correct answer is Citizens.
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