The diagram shows a consumer’s demand curve for a product.
How does consumer surplus change as the price of the product falls by $\$ 5$ increments between $$\$ 20$$ and $\$ 5$?

1 )
It increases at a constant rate (%) with each $5 fall.
2 )
It increases by a constant amount with each $5 fall.
3 )
It increases by a decreasing amount with each $5 fall.
It increases by an increasing amount with each $5 fall.
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