Indifference curves and budget lines — practice question

With a fixed income, a consumer may buy two goods, X and Y. What would cause the consumer’s budget line to shift parallel to the right?

• Aconsumer’s income 10% decrease; price of good X 20% decrease; price of good Y 10% decrease
• Bconsumer’s income 10% decrease; price of good X 20% decrease; price of good Y 20% decrease
• Cconsumer’s income 10% increase; price of good X 10% increase; price of good Y 20% decrease
• Dconsumer’s income 10% increase; price of good X 20% increase; price of good Y 20% increase