According to the Textbook "Convenience Has Its Costs

According to the textbook "Convenience has its costs." What does this mean?

A) Fast foods are expensive and higher in kcalories than comparable foods prepared at home.
B) Fast foods are expensive,but are usually lower in kcalories than comparable foods prepared at home.
C) Fast foods should never be consumed as they are expensive and unhealthy.
D) Fast foods are typically high in fat and sugar but not in kcalories.