To determine which type of text the paragraph best introduces, we need to consider the content and purpose of the paragraph.
If the paragraph is discussing the importance of reducing plastic use and providing strategies or statistics about how to do so, then the best introduction would be:
d. an informative text about how people can use less plastic.
If the paragraph is aimed at persuading people to take action against pollution in general or addressing pollution from plastic specifically, then option c might fit better.
Without the specific paragraph text, option d seems most likely if it focuses on practical advice or information about reducing plastic consumption. If you provide the paragraph, I could give a more accurate assessment!