The following diagram shows two budget lines: A and B. 
Which of the following could explain the change in the budget line from A to B?
Definitions:
Apples
A common fruit that is grown worldwide and comes in various varieties, often consumed fresh, cooked, or juiced.
Pears
A type of fruit known for its sweet taste, bell shape, and variety of colors and sizes.
Opportunity Cost
The cost of forgoing the next best alternative when making a decision to pursue a particular action or resource allocation.
Doghouses
Small shelters or buildings designed specifically for dogs to provide them with a sense of security and protection from various environmental conditions.
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