Read the following text from " Gulf Recovery Effort" (the part of the Article written by Habitat for Humanity International). 1. "Survivors of the 2005 hurricanes tell the simply: Everything happened " before the storm" or after the storm". Katrina has become the line of demarcation between normal life and now, between living and simply surviving.

2. Three years later, the destruction of property and the displacement of human beings feel surprisingly raw. And yet, the sense of hope is palpable.

3. Within weeks after Hurricane Katrina barreled across the Gulf Coast, Habitat for Humanity International and its affiliates had started building houses and rebuilding lives

4. The commitment has only grown stronger and deeper. With the help of tens thousands of volunteers, more than 1,300 homes have already been built or are under construction in the Gulf Coast Recovery Program in Louisiana, Mississippi, Alabama, and Texas.

5. In May 2008, more than 5,000 volunteers joined in the Jimmy and Rosalynn Carter Work Project at sites along the Gulf Coast from Mobile, Alabama, to Beaumont, Texas, Their effort helped 250 more families closer to living in a secure home once again.

6. Still, there is much work to be done. Each month, Habitat affiliates and volunteers start working on 52 more homes. For perspective, consider that before the storm, Habitat built 57 homes a year along the Gulf Coast.

7. Three years later, people still talk about what was lost. But more often, they also talk about what's possible. If you are interested in volunteering please visit our Volunteer Opportunities Web site, and contact a Habitat affiliate directly to volunteer."

If you wanted to create a persuasive thesis for the last sentence of the introductory paragraph, which of the following would be a good option?
a) Habitat for Humanity is working to improve the lives of those affected, and they could use more volunteers.
b) Habitat for Humanity is working to improve the lives of those affected.
c) Habitat for Humanity is a wonderful organization that helps many people.
d) Habitat for Humanity has done a lot to help people affected by Katrina.