Tongue Twister: Betty's Butter Dilemma

Explanation:

Betty bought some better butter to make the bitter butter better. This tongue twister describes a situation where Betty initially purchases butter that has a bitter taste, which is an unpleasant and sharp flavor. Dissatisfied with her purchase, Betty decides to buy some better butter, meaning butter that is presumably of higher quality and without the bitterness, to improve or 'make better' the original bitter butter. Therefore, the answer to what Betty bought to make the bitter butter better is option 2: some better butter.