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The correct answer is option 3, Leguminosae.
Solanaceae is a family of flowering plants that includes plants like tomatoes and potatoes, but it does not typically include pulse-producing plants.
Malvaceae is another family of flowering plants that includes plants like hibiscus, cotton, and okra, but it also does not typically include pulse-producing plants.
Liliaceae is yet another family of flowering plants that includes plants like lilies and tulips, but it does not include pulse-producing plants either.
Leguminosae, also known as Fabaceae, is the family of flowering plants that includes pulse-producing plants like chickpeas, lentils, and beans. These plants have the ability to fix nitrogen in the soil, which makes them important for crop rotation and soil fertility. Therefore, pulse-producing plants are kept in the class Leguminosae.