Of the following choices, which could have shifted Hilary's budget constraint from BC₁ to BC2? Check all that apply.
The price of baseball tickets increased while her income and the price of symphony tickets stayed the same.
The prices of both baseball and symphony tickets decreased while her income stayed the same.
Her income increased while the prices of baseball and symphony tickets stayed the same.
The price of symphony tickets increased while her income and the price of baseball tickets stayed the same.