The market for which item generally involves pure competition?

The market for which item generally involves pure competition?

a. cola
b. corn
c. jeans
d. ice cream

I personally think Cola and ice cream has big competition. Corn also belongs in the same market (food market) but jeans is a different market so i can’t say much about competition between them. But ice cream and Cola can be considered products that have a competition as both of these products are loved by consumers in summer season. For me, i personally prefer ice cream over cola X"D. i think it’s less dangerous for one’s health. my personal choice is Brown Sugar Boba Ice Cream as its taste is really good