Okay the answer is B. Paul of Tarsus,
Judas Iscariot was the Disciple of Christ that betrayed him to the Jewish leaders and was the cause of his death. So C is wrong
Pontius Pilate was a roman governor at the time who tried Christ and sentenced him to death howbeit unwillingly. so D is not the correct answer.
Nero was the 5th Roman Emperor I believe at the time of Christ's death. so A isn't the correct answer.