Which of the Following Best Describes Frederick II's Relationship with the Pope

Which of the following best describes Frederick II's relationship with the pope?

A) His relationship with the pope was disastrous; he was excommunicated four times.
B) His relationship with the pope was brilliant; he reestablished strong church-state relations.
C) His relationship with the pope was nonexistent; due to specific alliances, the papacy proved to be the enemy.
D) His relationship with the pope was tumultuous, but remained close.