The growing popularity of energy conservation has enticed large home improvement stores like Home Depot and Lowes to offer tankless water heaters. How does the fact that home improvement stores now offer these products affect the tankless water heater market?

A$.$ The demand curve for tankless water heaters shifts to the left.

B$.$ The supply curve for tankless water heaters shifts to the right.

C$.$ The demand curve for tankless water heaters shifts to the right.

D$.$ The supply curve for tankless water heaters shifts to the left.