What does Class A mean for average benefit per mu?

Effectiveness per mu Class A Comprehensive evaluation of annual industrial yield benefit per mu Class A enterprises with land of more than 3 acres

According to the ranking of comprehensive evaluation scores, enterprises will be classified into categories. A (priority development category, top 20%, inclusive), B (encouragement promotion category, 20%~65%, inclusive 65%), C (standardized transformation category, 65%~95%, inclusive 95%), D (Regulatory assistance category, bottom 5%) four levels.