The Harappa site is known for providing evidence of two cultural phases: Harappan and pre-Harappan. The correct answer to this question is option 4, Banwali. Banwali is an archaeological site located in the state of Haryana in India. Excavations at Banwali have revealed two distinct cultural phases, the pre-Harappan and the Harappan. The pre-Harappan phase is associated with a rural agricultural community, while the Harappan phase represents the urban civilization of the Indus Valley Civilisation. The site at Banwali has provided valuable insights into the transition from a pre-Harappan society to the fully developed Harappan civilization. It is important to note that while options 1, 2, and 3 (Lothal, Mohenjodaro, and Chanhudaro) are also significant archaeological sites of the Indus Valley Civilization, they do not specifically demonstrate evidence of two distinct cultural phases like Banwali does.