The action by OPEC that would cause oil prices to increase is decreasing oil supply/production. When OPEC reduces the supply of oil, it can lead to higher prices due to the basic principle of supply and demand: a decrease in supply, with stable or increasing demand, typically results in higher prices.
In contrast, increasing oil supply/production would generally lead to lower prices, as would endorsing a new oil pipeline, which could facilitate greater oil flow to the market and potentially increase supply. Therefore, the correct answer to what would cause oil prices to increase is only the first option: decreasing oil supply/production.
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