Mary is neglecting school and work responsibilities by spending much of the day on her smartphone checking email, responding to messages, updating her social media accounts, and playing games. It is possible that Mary has a:
a. both a and b
b. none of the above
c. substance addiction
d. process addiction

c) substance addiction

Explanation:

because she's constantly spending time on her smartphone

what is the tax base for the sales tax?

it should be (usually ) 6%

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