Which of these details is relevant to the following claim:

The U.S. government has taken steps to help those affected by 9/11 related diseases.

A. Experts estimate that within a few years, the death toll from 9/11 illnesses will exceed the death toll from the horrific day itself.

B. Many first responders have had to stop working because of their health problems.

C. People living or working near the towers also experienced varying amounts of exposure, as did people involved in cleanup efforts in the weeks and months that followed.

D. The government created The World Trade Center Health Program to help victims of 9/11 related diseases.