enough 跟名词和形容词的用法

enough 跟名词和形容词的用法
There is ( ) in our classroom.
a.light enough b.enough light
c.bright enough d.enough bright
语法：enough+名词,形容词+enough
所以这道题应该选c啊,但答案是d.是答案错了还是我错了.大家讲一讲原因和enough的用法.
B应该不行吧，要用light这里要加s吧？所以选D是对的咯？把btight解释为名词。