@$1$@Building Energy Performance Certification is a process that evaluates and measures the energy efficiency of buildings. It provides an assessment of a building's energy performance based on factors such as insulation, heating and cooling systems, lighting, and renewable energy use. The certification aims to promote energy$-$efficient practices in buildings and encourage the reduction of energy consumption and greenhouse gas emissions.

Objective type question:

Building Energy Performance Certification is a process that assesses the $\_\_\_\_\_\_\_\_\_\_$ of buildings.

A$)$ Structural integrity B$)$ Energy efficiency C$)$ Aesthetic appeal D$)$ Cost$-$effectiveness

Please select the correct answer by choosing the corresponding letter $($A$,$ B$,$ C$,$ or D$).$