I am blessed with a great class, everyone is hardworking, kind and friendly to each other.

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(答案→)A. one where
B. the one that
C. the one where
D. one that
解析：句意：我很高兴有个很好的班级，一个每个人都很勤奋彼此友好的班级。One指代a class，定语从句中缺少地点状语，用where引导定语从句，不缺主宾表，不用that引导，the one表示特指，选A。