Which of the following changes would cause the demand curve for silk scarves to shift to the left?

Which of the following changes would cause the demand curve for silk scarves to shift to the left? (Need help? Read chapter 3.2 of the textbook, here: https://playconomics.com/textbooks/view/playconomics4-2019t3/part2/ch3/s An increase in the income of shoppers. None of these. An increase in market price of silk scarves An decrease in the market price of hats (if hats and scarves are complements). News that stores are having sales on scarves (which have already begun)