A start-up is launching a sustainable fashion brand and decides to use Pinterest to target Gen Z customers interested in eco-friendly products. Their plan is to create Pins featuring sustainable clothing emphasizing eco-friendly materials and ethical manufacturing processes. When targeting Gen Z users interested in sustainability on Pinterest, which approach is most effective?

Interest targeting focused on "sustainable living" and "eco-friendly products" is most effective because it directly aligns with the brand's niche and the target audience's known interests. Gen Z users interested in sustainability are actively searching for and engaging with content related to these specific topics on Pinterest. This method ensures the Pins reach users who are already predisposed to eco-friendly fashion. Demographic targeting based on age and location only is too broad; while it reaches Gen Z, it doesn't guarantee an interest in sustainability. Keyword targeting with terms unrelated to sustainability would lead to irrelevant ad placements and wasted budget. Placement targeting in adjacent categories might reach some relevant users, but it's less precise than directly targeting stated interests.