单项选择题

By the way, if you are wondering where the Bluetooth name originally carne from, it is named after a Danish Viking and King, Harald Blaatand (translated as Bluetooth in Englishl. who lived in the latter part of the 10[th] century. Harald Blaatand united and controlled Denmark and Norway (hence the inspiration on the name: uniting devices through Bluetooth). He got his name from his very dark hair which was unusual for Vikings, Blaatand means dark complexion. However, a more popular, ( but less likely reason) , was that Old Harald had an inclination towards eating Blueberries ,so much so his teeth became stained with the color, leaving Harald with a unique set of molars (白齿).
Who was Harald Blaatand

A. A Viking pirate in the 10[th] century.
B. The king of Denmark for most part of the 10[th] century.
C. The king ruling Denmark for the latter part of the 10th century.
D. A typical Viking who had very dark hair.
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