Based on the Diagram Below It Can Be Inferred That

Based on the diagram below it can be inferred that:

A) hot dogs are a normal good for all levels of income.
B) hot dogs are an inferior good, but not a Giffen good, for all levels of income.
C) hot dogs are a Giffen good for all levels of income.
D) hot dogs are an inferior good for low levels of income, but at higher levels of income become a normal good.
E) none of the above