watching birds collecting seashells eating a picnic lunch building a sand castle
I gave my students this multiple choice question: Beach pollution includes sewage, paper and plastic containers, and oil from boats. Which beach activity most likely increases beach pollution?

Only one answer is correct among these 4 choices:
- watching birds
- collecting seashells
- eating a picnic lunch
- building a sand castle

Could you tell me which one is correct?

eating a picnic lunch