Determine whether each of the following transactions would result in an increase in basis, a decrease in basis, or no effect on basis:
a. Dolly pays $3,000 for a survey to disprove her neighbor's claim that the boundaries dividing their properties are in error.
b. Dolly pays a $500 street improvement assessment.
c. Dolly receives $1,000 from the county for a portion of her property that was needed to widen the street.
d. Dolly's property tax bill totals $1,200 for the year.