A paint maker has announced that it has developed a new type of environment friendly paint that is natural, economical, and free of any pollution. However, in the production process of paints, it discharges contaminated gases. What kind of behaviors does this as sustainable tool belongs to?
A. Greenwashing
B. Life cycle assessment
C. Design for environment
D. Sustainable design
某涂料生产企业宣称开发出一种新型环保涂料，自然、经济、无任何污染，但是在涂料的生产过程中，却对外排放污染气体，这是可持续性工具的哪种行为？