Last Year, Casey Grew Fresh Vegetables, Which She Sold at Her

Last year, Casey grew fresh vegetables, which she sold at her local farmers market, but this year, Casey did not plant any vegetables and went to work at a bank instead. If Casey's decision to change careers did not affect the price of vegetables at the farmers market, then this suggests that:

A) the demand for vegetables did not change.
B) the market for vegetables is perfectly competitive.
C) the demand for vegetables increased this year.
D) the market demand for vegetables is perfectly inelastic.