Hundreds of sea gulls scavenge for food as bulldozers bury rubbish at the now-closed Wake County Landfill in North Raleigh in this file photo. A study by Duke University researchers concludes that gulls feeding on trash can be a significant course of nitrogen and phosphorus at nearby lakes. TRAVIS LONG TRAVIS LONG

Choose your answer: based on the paragraph above can we conclude that "The study was done by Duke University researchers."?

OPTIONS: (a). Yes; (b). It's impossible to say; (c). No;
I think the answer is