6. Illegal immigrants pay local sales taxes, and many of them also pay state, local, and federal income tax and Social Security tax. They also purchase items from local merchants, increasing the amount these merchants pay in taxes. In addition, they work for low salaries, which increases the earnings of their employers and the amount of taxes these employers pay. Thus, it is wrong to say that illegal immigrants contribute nothing to the communities in which they live.

a. Argument; conclusion: It is not correct to say ... communities in which they live.

b. Argument; conclusion: They work for low salaries ... these employers pay.

c. Argument; conclusion: They also purchase items ... pay in taxes.

d. Not an argument.

Explanation: The requirements for legal immigration are so strict and unenforceable for most people wishing to move to other territories that illegal immigration becomes the only viable option. Requirements include direct kinship with a US citizen, for example, high specialization in a professional or academic field, a large investor ($ 500,000 to $ 1 million) or entrepreneur who generates employment in the country, among others.