Answer:
The correct answer is C. The producer's price index in that area.
Step-by-step explanation:
The producer price index (PPI) is an indicator of the evolution of producer sales prices, corresponding to the first marketing or distribution channel of goods traded in the economy. The difference with the consumer price index (CPI) is explained because a good can be marketed or distributed by different intermediaries that will modify the sales price until it reaches the final consumer.