There are tons of antonyms for credible out there, but really good ones include deceptive, dishonest, undependable, unreasonable, etc...
Hope this helped!!!!!
D would be the answer I would choose, I'm not 100%
Dummies were successfully used as a distractors to the Germans.
Lives were lost due to missed targets and poor weather.
The U.S. military fought with Allied powers.
By sensing mistrust of each other and it became worst when they competed for colonies in Asia and Africa
