阅读下面语句
<set>
<if test="bName != null "> bName=#{bName} ,</if>
<if test="bAuthor != null "> bAuthor=#{bAuthor} ,</if>
</set>
BName为“张”，bAuthor为null，则形成的语句为（ ）？
A.set bName=”张”,bAuthor=null,
B.set bName=”张”,bAuthor=null
C.set bName=”张” ,
D.set bName=”张”
正确答案是D