each of the following describes a not for profit activity (hobby) except?

A Mary Kay consultant who deducts travel expenses and whose small customer base was mostly relatives who lived out of town.

a taxpayer who had a model railroad activity and did not keep a separation checking account.

A university research association who had made profits on her research activities in the past and fully expected to do so in the future

. a taxpayer who wrote travel while on trips she had planned without consulting a publisher or doing any marketing research