A student is writing a report on 'Hydropower's Environmental Impact'. Which sentence demonstrates the most appropriate formal tone for an academic report?
A) Hydropower totally messes up fish habitats, which is bad.
B) The construction of hydroelectric dams can significantly alter aquatic ecosystems and disrupt fish migration patterns.
C) I think hydropower is bad for the environment because of the fish.
D) So, like, hydropower can sometimes have negative effects on nature.