What reason$($s$)$ does the author offer for why the ground of disability makes up the bulk of accommodation claims? $($p$.380)$

a$.$ Because people with disabilities remain among the poorest citizens, and claims are viewed as a way to enable them to change that fact

b$.$ Because the nature of disability is such that it is particularly difficult to find new employment relative to those who would fall under other grounds, such as race or sex

c$.$ Because the nature of disability is such that the accommodation varies more greatly than for other grounds and it is more changeable than other grounds