求助 "...", said Prof.X in his report还是"...", Prof.X says in h

hehe127

记得之前考过一道语法，但是犹豫了，一直不确定。注："..."是报告中的内容，一句话。
A. "...", said Prof.X in his report.
B."...", Prof.X says in his report.
C."...", says Prof.X, in his report.
D."...", Prof.X said in his report.

疑问一：是 say+s.b 还是s.b+say？
疑问二：描述某书或报告中的内容，是用一般现在时还是过去时？
疑问三：逗号是否应该存在,如C选项！

求讨论，谢谢大家！