removing primary producers spraying of insecticides increasing runoff planting flowers
I gave my students this multiple choice question: Scientists have discovered that there has been a reduction in the butterfly population in an ecosystem. After much research, they have identified that the carrying capacity for butterflies has been decreased. If the scientists want to increase the butterfly population, which action should they recommend?

Only one answer is correct among these 4 choices:
- removing primary producers
- spraying of insecticides
- increasing runoff
- planting flowers

Could you tell me which one is correct?

planting flowers