Concerns about hmos include all of the following except questions about care allocation.

I think you failed to input the choice of answers needed for this question since there is an EXCEPT word stated on the question. I will give you a brief description regarding HMO.

HMO stands for Health Maintenance Organization. This is a kind of plan wherein most of your medical needs are being attended through the help of local healthcare providers and some in-network specialists.

Ibelieve this would be an obstacle.