The correct answer is option 4 - Temple with Shikhar. In the excavation of Harappan sites, many features have been found such as drains and wells, forts, and reservoirs. The presence of well-developed drainage systems indicates their advanced understanding of urban planning. Forts suggest the need for defense and protection of the civilization. Reservoirs were used for storing water, highlighting their knowledge of water management. However, a temple with a shikhar, which is a pyramidal tower-like structure commonly seen in Hindu temples, has not been found in Harappan sites. This suggests that the Harappan civilization did not have a prominent religious or architectural tradition that involved the construction of temples with shikhars. Therefore, option 4 is the correct answer.