Answer:
Correct answer is Spain.
Step-by-step explanation:
Pope was not a common enemy, as Morocco didn't had any disputes with the Papal State, while in the 16th Century had tense relations with Papal State.
Second option is not correct as Ahmad al-Mansur was the ruler of Morocco in the 16th Century and the one that established good relations with England.
Third option is correct as Spain was a common enemy of both countries, especially during the reign of Philip II.
Edward VI was a ruler of England who reigned during his childhood and didn't had many influence during his reign.