【单选题】

TheBritish are theEuropean Union’s worst linguists while the citizens of Luxembourg are the best, according to anEU poll published recently.Almost two-thirds ofBritons know no language apart from their mother tongue, the highest figure recorded in the 15EU countries. That compares to just 2.2 percent in Luxembourg, 12.3 percent ofDanes and anEU average of 47.3 percent of people who speak no other language but their own, the poll of 16,000Ell citizens saiD、ButBritish travelers toEurope need not worry.English is the most common second language in theEU, spoken by 41 percent of the block’s citizens. InDenmark, Sweden and the Netherlands, at least 78 percent of people speakEnglish as a second language.Although 47 percent ofEU citizens know only their mother tongue, there is wide agreement that speaking foreign language is good thing. 72 percent of those polled believe foreign language skills are useful, 71 percent said everyone should know one foreign language and 69 percent said everyone should speakEnglish.

Which country has a percentage of 12.3 population that know no language apart from their mother tongue
A、Britain.
B．Luxembourg.
C．Denmark.
D．Sweden.