The question is asking which activity you are least likely to do while shopping. Here’s a brief overview of each option:
- gastar dinero - spend money
- anunciar una liquidación - announce a sale
- probarse la ropa - try on clothes
- encontrar una ganga - find a bargain
Out of these options, you are least likely to anunciar una liquidación (announce a sale), as this is typically not something a shopper would do; it is more of a retailer's action.