The answer would be A. However
The Byzantines spread Christianity mostly by sending out missionaries for the Greek Orthodox Church.
"B. The English Channel helped protect the island nation of Britain from invasion" would be the best option from the list, since this Channel was oftentimes very choppy with strong currents.
The best and most correct answer among the choices provided by the question is the fourth choice "Spain"
<span>New Imperialism or Neo-imperialism was a period of colonial expansion by European powers, the United States of America, and the Empire of Japan during the late 19th and early 20th centuries.</span>
I hope my answer has come to your help. God bless and have a nice day ahead!