Which was not a feature of welfare reform?
increased work requirements
less cash assistance
a five-year limit on cash assistance
public transportaion vouchers

As far as I could find, the following were a feature of the reformin 1996: 

increased work requirements (especially after two years)
a five-year limit on benefits from federal funds

So these were definitely a feature. 
Of the remaining two, it is true that the cash assistance was diminished in 1996. 

So i think that the transportation vouchers were not provided. Additionally, I found that transportation costs can be deducted from taxes by the employers, and that there is a number of smaller programs providing transportation benefits, but I don't think that they were a major part of the reform (so the last option).

Ais the correct answer