introduction of a non-native species reduced daylight hours during winter preventing the cutting of trees in forests riverbank erosion resulting from springtime flooding
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which of the following is most likely to disrupt the natural balance in an ecosystem?
Possibilities:
- introduction of a non-native species
- reduced daylight hours during winter
- preventing the cutting of trees in forests
- riverbank erosion resulting from springtime flooding

introduction of a non-native species