judging by [from] ... =  to judge by [from] ... 根据 ... 判断：

所以，答案应该是 A。

1 Judging by what everyone says about him, I’d say he has a good chance of winning.

   本句中的judge动作的执行者是句子的主语I, 为主动。

2 Judged by God, we're all sinners.

   本句主语we和judge之间是被动关系，所以用judged.

3 希望对你理解，有所帮助。

更多例句：
牛津高阶：
Judging by her last letter, they are havinga wonderful time.
牛津：
Judging from his letters home, Monty was ingood spirits.
He knows that, judging from opinion pollresearch, concentrating on Europe as an issueis normally the route to defeat.
The majority of America must then be liberals,judging from recent public opinion polls.
It sounds like hard work - it is hard work- but judging from the volunteer diaries on the website, it is very rewarding.
剑桥：
judging by/from (also to judge by/from) -used to express the reasons why you have a particular opinion根据…判断

Judging by what he said, I think it's veryunlikely that he'll be able to support your application.从他说的话看来，我认为他不太可能会支持你的申请。
朗文：
judging by/from - somethingused to say thatyou are making a guess based on what you have just seen, heard, or learned:
Judging by his jovial manner he must haveenjoyed his meal.
Judging from what you say in your letter,you don't sound well.