Which factor will not cause an increase in demand for good X? a decrease in the price of good X a decrease in income if good X is an inferior good an increase in income if good X is a normal good an increase in the popularity of good X with consumers

I believe it's "a decrease in income if good X is an inferior good"

Explanation:

If the price is decreased people are more likely to buy it. If people have more money they are more likely to buy more thinks including good X. An increase in popularity with good X is sure to make more people want to buy it, so the second option is the only one that really makes sense.