Which of the following will cause an increase in the quantity demanded along a downward sloping demand curve for ice cream cones at Baskin Robins chain stores?

Sizzling temperatures on a summer afternoon in Phoenix.

The price of yogurt the chain sells increases 50%.

A new technology is discovered that allows Baskin Robins to make ice cream using new machinery at half the cost of the old machinery.

Baskin Robbins announces that the price of their ice cream has been reduced by 25%.

The income level of ice cream consumers increases 25%.