When Her Income Increased from $10,000 to $20,000,Heather's Consumption of Macaroni

Multiple Choice

When her income increased from $10,000 to $20,000,Heather's consumption of macaroni decreased from 10 pounds to 5 pounds and her consumption of soy-burgers increased from 2 pounds to 4 pounds.We can conclude that for Heather,

A) macaroni and soy-burgers are both normal goods with income elasticities equal to 1.
B) macaroni is an inferior good and soy-burgers are normal goods;both have income elasticities of 1.
C) macaroni is an inferior good with an income elasticity of -1 and soy-burgers are normal goods with an income elasticity of 1.
D) macaroni and soy-burgers are both inferior goods with income elasticities equal to -1.