What does a green building focus on?

Correct answer: Energy and resource efficiency

The governing concept is resource-efficient and environmentally responsible building design. A green building aims to provide safe and useful indoor spaces while reducing unnecessary consumption of energy, water, materials, and other resources. Features may include efficient lighting and appliances, natural daylight, ventilation, water-saving fittings, durable or recycled materials, waste management, and designs that suit the local climate. The exact features vary by building and standard, but the central focus is efficiency and reduced environmental impact. Option A is therefore correct. More wastage and more smoke conflict with green design, while tall walls alone do not make a building environmentally sustainable or energy efficient.