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.