Hello, please help me with this I continue to get it incorrect.

12 . Problems and Applications Q6 which of the following situations illustrate the problem of the introduction of new goods in the construction of the CPI? Check all that appfy. C The invention afcell phones Increased personal computer purchases in response to a decline in thelr price More scoops of raisins in each package of Raisin Bran C C C Greater use of fuelefficient cars after gasoiine prices increase C The introduction of air bags in cars