Sentence Correction

i am debating between A & B. Please explain your answer.

Providing attenuate Public Health-care facilities is a crucial task in a country like Travis, (where more than 60 Percent of household incomes are) below the Poverty line.
A) where more than 60 Percent of household incomes are
B)where more than 60 Percent of household income is
C)which has more than 60 Percent of household incomes
D) where they have more than 60 Percent of household income
E)where more than 60 Percent of them have household incomes

IMO: A

more than 60% of incomes

60% is subject -- plural --> so A seems to be ok.