What was the main way Charles V and Philip II maintained Spanish power in Europe?

A.
by making treaties with neighboring countries

B.
by avoiding involvement in other countries' affairs

C.
by waging war against their enemies

D.
by creating an alliance with the Ottoman empire

3 answers

http://www.slader.com/discussion/question/how-did-spanish-power-grow-under-charles-v-under-philip-ii/
I am not giving you the answers but I will be happy to check your work now you think what the answer is?
The answer is C, try it yourself.
I already did the test myself.