In Recent Years Attention Has Focused on the Plight of the Homeless

In recent years attention has focused on the plight of the homeless in the United States because:

A) they create a large drain on the Social Security system.
B) their lobbying has given them a disproportionate voice in the legislative process.
C) many of them receive no government aid since they do not qualify for specific programs, have no address, or do not sign up for benefits.
D) all of the above.