The diagram below illustrates the market for Arabica coffee beans, where the supply curve shifts from S1 S_1\,S1 to S2S_2S2.
All other things being equal, which of the following is most likely to have caused the shift in the supply curve from S1 S_1\,S1 to S2S_2S2?
An increase in the market price of Arabica coffee beans.
A technological breakthrough in harvesting machinery that lowers production costs.
An increase in the market price of cocoa, where cocoa and Arabica coffee are in competitive supply.
A successful marketing campaign that increases consumer preference for Arabica coffee.
