Answer:
b. an increase in the demand for the good.
Step-by-step explanation:
There is a positive relation in the case of normal goods that means if the income of a person increased the demand for the goods is also increased
While on the other hand if the income of the person increased the demand for the goods decreased and this reflects that the good is inferior
since the goods are normal and there is an increase in income so there would be increased in the demand due to a positive relationship between the income and the quanti\ty demanded