The best and most correct answer among the choices provided by the question is the first choice "<span>The Rus established a strong trading relationship with Constantinople."
</span>A monarchy formed in Kiev, and the Kievan Rus came into being. ... Contact and trade between Kiev and Constantinople increased. Kiev became a major trading hub in eastern Europe, and other than tangible goods, religion from the Byzantine Empire found its way into Kiev. <span> I hope my answer has come to your help. God bless and have a nice day ahead!</span>
