The correct answer is: A. Only argument I is strong
Argument I is strong because it is based on the fact that cutting trees disrupts the ecological balance. Trees play a vital role in the environment, and their removal can have a number of negative consequences, such as soil erosion, climate change, and the loss of biodiversity.
Argument II is weak because it is based on the economic interests of timber-based industries. While it is true that a total ban on tree cutting would harm these industries, this is not a valid reason to continue cutting down trees. The economic interests of a few industries should not be put ahead of the health of the environment.
In conclusion, only argument I is strong.