Which of the following fruits might raise kosher concerns that require eligibility checks?

Grapes may raise kosher concerns that require eligibility checks due to their association with wine production. In Jewish dietary laws, kosher wine must be produced by Jewish individuals and meet specific religious standards. Because grapes are the primary ingredient in wine, they need to be carefully monitored to ensure they haven't been used in non-kosher wine production or have come into contact with non-kosher equipment. This means that grapes, unlike bananas, berries, or apples, which generally do not have such strict requirements associated with their consumption, require extra vigilance regarding their source and handling within kosher dietary practices. Additionally, certain practices in vineyard management, such as using specific fertilizers or treatments, can also influence whether the grapes meet kosher standards, further emphasizing the need for eligibility checks.