In this scenario, if the income levels of consumers increase, the demand curve for cell phones, which is considered a normal good, would shift to the right. This is because as consumers have more income, they will likely buy more cell phones.
On the other hand, the demand curve for instant noodles, which is categorized as an inferior good, would shift to the left. As consumers' incomes increase, they tend to buy less of inferior goods like instant noodles, as they can now afford better alternatives.
Therefore, the correct response is:
The demand curve for cell phones would shift to the right, and the demand curve for instant noodles would shift to the left.