Refer Figure $21-5$ where the consumer is on indifference curve IC$1$ and is equally happy consuming the bundles of gummi bears and gum drops indicated by points W $,$ X $,$ and Y $.$ Suppose the consumer moves from point W to point X along his indifference curve. What must happen to make the consumer equally happy?

Consumption of gummi bears must decrease.

Consumption of gum drops.

Consumer of gummi bears must stay the same

Consumption of gummi bears must increase.