1. The United Nations introduced the 17 Sustainable Development Goalsin 2015. One of which is gender equality, and it states that "genderequality is not only a fundamental human right, but a necessaryfoundation for a peaceful, prosperous and sustainable world."However, although increasingly organizations are advancing women(as well as minorities) to senior level positions but only a limitednumber of functional areas, such as public relations andcommunications. This can be referred as?
(A) Glass ceiling
(B) Glass wall
(C) Glass cabinet
(D) Glass floor
(E) Glass bamboo