Argument I supports the statement by highlighting that hydroelectricity emits almost no CO₂, making it cleaner and greener than fossil fuel-based power. Argument II, however, points out the negative ecological impact - flooding of large areas and damage to biodiversity - which challenges the "greener" claim. Thus, I strengthens the statement by emphasizing environmental cleanliness, while II weakens it by exposing ecological drawbacks.
Thus, II weakens while I strengthens the statement.
So, option 3 is the correct answer.
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