The executive branch of US government is responsible for the execution of the laws and policies of the Federal government.
Explanation:
The President of the United States acts as the head of the state and all the powers of the executive branch of the US federal government lies on him. The executive branch is the most powerful branch in any government.
The Executive branch consists of the US President, US Vice President and the Cabinets. It is the responsibility of the executive branch to draft proposed laws, it makes appointment to the most important official posts in the US government and other agencies. It makes laws and policies for the people and the country. It enforces those laws and regulations. It has the power to declare war and peace.
Personally I would say it's A (apart from the installation costs which may make it a little expensive) but it does involve certain aspects of D also as wind energy doesn't cause pollution. So either A or D!
Some of the most typical characteristics of groundwater are weak turbidity, a constant temperature and chemical composition and almost overall absence of oxygen. Circulating groundwater can have extreme variation in the composition with the appearance of pollutants and various contaminants.
