Question $4$: Daniel consumes coffee $(C)$ and bagels $(B).$ On Monday his budget line was

described by the equation $B=20-2C.$ On Tuesday his budget line could be described by the

equation $B=10-C.$ The change in the budget line between Monday and Tuesday could be

explained by the fact that

A$.$ the price of coffee and Daniel's income both increased.

B$.$ the price of coffee increased and Daniel's income decreased.

C$.$ the price of coffee decreased and Daniel's income increased.

D$.$ the price of coffee and Daniel's income both decreased.

E$.$ Daniel's utility for bagels decreased.