Maria graduates from college and her income increases by $35,000 a year. nothing else changes. maria decreases the quantity of donuts and pizza that she buys and increases the quantity of tickets to orchestra concerts that she buys.
for maria,
a. ketchup and chocolate chip cookies have become complements
b. ketchup and chocolate chip cookies are inferior goods
c. ketchup and winter vacations have become substitutes
d. winter vacations and chocolate chip cookies are normal goods

B. ketchup and chocolate chip cookies are inferior goods 

Explanation:

The options and the question seems not to match. The correct question can be found here: https://www.chegg.com/homework-help/questions-and-answers/maria-graduates-college-income-increases-35-000-year-nothing-else-changes-maria-decreases--q30165223

A normal good is a good whose demand increases when income increases. In this question, winter vacations is a normal good.

An inferior good is a good whose demand increases when income falls and whose demand falls when income rises. In this question, ketchup and chocolate chip cookies are inferior goods.

I hope my answer helps you

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