Answer:
C. They thought a king would be in Jerusalem.
Explanation:
A magi can be defined as a group of wise men who are saddled with the responsibility of studying the stars.
The "magi" visited Jerusalem to find the new king of the Jews because they thought a king would be in Jerusalem.
Basically, the "magi" paid a visit to Jerusalem and stopped over at the king's palace. The king at the time was King Herod, of which they asked him; where is the new born king of the Jews.