Solution:Harappan civilization, or the Indus Valley civilization, is known for its urban centers, script, and mature phase.
• Farmana (a): Located in Haryana, Farmana is an important Harappan site. •Badli (b): Another site associated with the Harappan culture.
• Hansi (c): It is not primarily associated with the Harappan civilization. •Khokhrakot (d): While it has ancient importance, it's not specifically a Harappan site.