Which of the Following Is True with Regard to Geographic

Which of the following is true with regard to geographic distribution and MS?

A) The highest frequency of MS occurs in areas of the southern United States and Europe and Northern Australia.
B) The highest frequency of MS occurs in areas of the northern United States and Europe,Scandinavian countries and southern Australia.
C) The highest frequency of MS occurs in tropical areas of Asia,Africa,and South America.
D) Geographical location does not affect frequency of MS.