Answer:
Budget Line rotates inwards (leftwards/ downwards) on that axis, optimal quantity demanded at that higher price .
Explanation:
Budget line represents product combinations that a consumer can afford , using all income with given prices & income.
If price of a product increases, the consumer can consume lesser amount of the product due to higher prices . So, the budget line rotates inwards (leftwards / downwards) on the corresponding x / y axis denoting that good.
So, inwards rotation of the budget line on the corresponding axis representing the price risen good - leads to reduction in the quantity of the good whose price has risen.