To solve this problem, we need to identify which of the given options is an example of an edible underground stem. Let's analyze each option:$\newline \bullet$Option 1: Carrot$\newline$ - Carrot is a root vegetable, specifically a taproot. It is not an underground stem.$\newline \bullet$Option 2: Groundnut$\newline$ - Groundnut, also known as peanut, is a legume. The edible part is the seed, which develops underground but is not a stem.$\newline \bullet$Option 3: Sweet potato$\newline$ - Sweet potato is a root tuber, which is a modified root, not a stem.$\newline \bullet$Option 4: Potato$\newline$ - Potato is an example of an underground stem, specifically a stem tuber. It stores nutrients and has nodes (eyes) from which new plants can grow.$\newline$Therefore, the correct answer is Option 4: Potato, as it is an edible underground stem.