it is between C and D....i think where is proper usage to refer shiprock....
(A) where the household incomes of 49 percent of them are - them is ambigous
(B) where they have 49 percent of the household incomes - they ambiguous
(C) where 49 percent of the household incomes are ==> no ambiguity where for shiprock
(D) which has 49 percent of the household incomes ==> false meaning as people living in community has house hold income less
(E) in which 49 percent of them have household incomes - them again ambiguous