When Sam Has an Income of $1,000,he Consumes 30 Units

Multiple Choice

When Sam has an income of $1,000,he consumes 30 units of good A and 50 units of good B.After Sam's income increases to $1,500,he consumes 60 units of good A and 45 units of good B.Which of the following statements is correct?

A) Both goods A and B are normal goods.
B) Both goods A and B are inferior goods.
C) Good A is a normal good,and good B is an inferior good.
D) Good A is an inferior good,and good B is a normal good.