Which of the following was the most successful missionary spreading the teachings of jesus to the people in palestine, asia, minor, greece, and rome?
a. nero
b. paul of tarsus
c. judas iscariot
d. pontius pilate

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.