Answer and Explanation:
In the case when the income increased so the demand also increased so the goods are classified as the normal goods. Therefore the apps are normal goods
In the case when the income increased but the demand declines so it is to be considered as the inferior goods so frozen pizzas are inferior goods
In the case when there is the decline in the income due to this the income rises so the goods are inferior goods. So, the generic cereal is an inferior goods
In the case when the income declines so the demand also declines this meand the goods are normal goods. So, smoothies are normal goods