Which of the following is most well-known as a legume?

Peanuts are well-known as legumes due to their classification within the family Fabaceae, which includes a variety of plants that are characterized by their ability to fix nitrogen in the soil through a symbiotic relationship with certain bacteria. Unlike the other options, which belong to different plant families, peanuts produce pods that contain seeds, a defining trait of legumes. This unique botanical feature allows peanuts to thrive in poor soil conditions where other plants may struggle. Additionally, legumes like peanuts contribute to soil health, making them an important component of sustainable agriculture practices.