What Are Some Variables According to the Researchers Cited in the Text

What are some variables according to the researchers cited in the text that lead to disparities in nursing home care?

A) Higher levels of need
B) Choosing to place family member into nursing homes that have low ratings
C) Placing family members in nursing homes in which the Nursing Home Administrators and/or Directors of Nursing have lower levels of education and fewer certifications
D) a and b
E) b and c
F) a, b, and c
G) None of the above