Please help

Question

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

my answers C

Answer 1

And also I have another question that needs to be checked,

Under Peter the Great, Russia fought Sweden and gained access to the Baltic sea . Catherine the Great further expanded Russia by fighting the Ottoman empire to gain access to the black sea .

is this correct?

Answer 2

The first one is correct i am not sure about your second answer

Answer 3

can someone give answers for the practice? my social studies class is EXTREMELY difficult and i cant find some of the answers in the text