facing this -------question,I found myself-----about how to

Facing this puzzling question,I found myself puzzled about how to work it out.( C )
面对这道难题,我真不知道该怎么解答它了.（该怎么解答它,我自己也迷糊了.）
puzzling与puzzled都含有“迷惑不解的”意思.但puzzling可做定语,修饰名词或代词；而puzzled做表语,表达“主语感到迷惑；迷茫”的意思.
puzzling question 令人迷茫的问题---难题
sb is puzzled 或 sb feel(s) pullzed 某人感到迷茫、迷惑不解