Final answer:
King is not a defined term in the context of renewable energy sources or drilling techniques for extracting oil and gas. All energy sources have environmental impacts, but renewable sources offer advantages like reduced greenhouse gas emissions.
Step-by-step explanation:
King is not a known term in the context of renewable energy sources or drilling techniques for extracting natural gas and oil. Therefore, options a), b), and d) are not applicable for the definition of 'king.'
Option c) is incorrect as well, because all energy sources have environmental impacts to some extent. For example, oil and gas extraction can result in spills that contaminate water sources and harm wildlife, while coal combustion emits carbon dioxide and pollutants that contribute to air pollution.
It is important to evaluate each energy resource for its environmental impacts and sustainability. Renewable energy sources, such as solar, wind, and biomass, offer advantages like reduced greenhouse gas emissions and decentralized control over power, but they also have room for improvement in terms of efficiency and cost.