Dravidian script is the closest to the Harappan script among the given options. Here's why:

1. Harappan script: The Harappan script was used during the Indus Valley Civilization (IVC) which existed from 3300 BCE to 1300 BCE. The script is yet to be fully deciphered, but it is believed to have been written from right to left and top to bottom.

2. Dravidian script: The Dravidian script is used to write the Dravidian languages spoken in South India, such as Tamil, Telugu, Kannada, and Malayalam. The script is also written from right to left and top to bottom.

3. Similarities: The Harappan script and the Dravidian script share some similarities in their structure and symbols. For example, both scripts have a large number of pictorial symbols, and both use a combination of single and double vertical lines.

4. Brahmi script: The Brahmi script is one of the oldest Indian scripts and was used to write Prakrit and Sanskrit. While it shares some similarities with the Harappan script, it is not as close as the Dravidian script.

5. Kharosthi script: The Kharosthi script was used in the northwestern region of the Indian subcontinent and was used to write Gandhari and Sanskrit. It is also not as close to the Harappan script as the Dravidian script.

In conclusion, based on the similarities in structure and symbols, the Dravidian script appears to be the closest to the Harappan script.

Dravidian