Donald was reading his twitter feed one morning and noticed an advertisement for his favourite hair spray. Best Salad Inc. was offering the hair spray at the low price of $$9\mathrm{.}95.$ When Donald got to the store, the sales clerk told Donald that the price was $$19\mathrm{.}95,$ and the advertisement was a mistake. What is Donald$$s legal position under contract law?

Question $9$ options:

Donald should have realized that the price was a mistake. The store is not required to sell the hairspray for $$9\mathrm{.}95.$

Advertisements are generally invitations to do business and not offers under contract law. The store is not required to sell Donald the hairspray for $$9\mathrm{.}95.$

Clearly the advertisement was a mistake. But because Donald did not know that Best Salad Inc. made a mistake, Donald$$s acceptance was binding. The store is required to sell the hairspray to Donald for $$9\mathrm{.}95.$

The advertisement was an offer. If Best Salad Inc. did not retract the advertisement, Donald could accept the offer and Best Salad Inc. would be legally bound to sell the hairspray to Donald at $$9\mathrm{.}95.$