Identify the correct order of density of population among the following districts of Himachal Pradesh according to 2011 census-data (in descending order):
(A) Bilaspur, Una, Solan, Mandi
(B) Una, Bilaspur, Solan, Mandi
(C) Una, Mandi, Bilaspur, Solan
(D) Bilaspur, Solan, Una, Mandi
Answer: B