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.