PLEASE HELP

Review the statements below and select the one that best describes the impacts that building dams can have on wildlife and the environment.

A) When a dam is built on a river, it alters the habitat and environment by rerouting the flow of water so that people and wildlife can make better use of the environment without significantly affecting ecosystems.

B) When a dam is built on a river, it alters the habitat and environment by displacing humans and animals from their homes. Fish and other wildlife can no longer move along the length of the river because the dam acts as a barrier.

C) When a dam is built on a river, it increases the available water, allowing people to irrigate crops and raise livestock, and it allows the inhabitants of the river to move freely along the length of the river.

D) When a dam is built on a river, it increases the available water for fish and other wildlife, thereby having only positive effects on wildlife and the environment.