Answer:
C. Most Americans do not want the jobs that are performed by undocumented workers.
Explanation:
This is the only statement that presents information of the positive aspects of the undocumented workers' presence in the country. One of the reasons americans don't want those jobs is because most of times they are underpaid and/or risky. The undocumented workers' presence allows americans to choose other options. This implies that the american economy relies, in a lot of aspects, on the hard work of this working force, without it a lot of problems would be faced.
The other statements are against undocumented workers as they present aspects of this type of immigration that afect the americans and their economy.