Correct option is C
At the Indus Valley Civilization site of Dholavira (located in present-day Gujarat), archaeologists discovered a large inscription made of white gypsum inlaid in wooden panels.
This discovery is often referred to as the "signboard" of Dholavira.
The letters are very large in size, visible from a distance, and are part of the Indus script (which remains undeciphered).
It was found near the northern gateway of the city, suggesting it may have served as a nameplate, public notice, or symbolic signage.
Additional Knowledge:
Lothal – Famous for dockyard and trade, no such signboard found.
Kalibangan – Known for fire altars and ploughed fields, not for large inscriptions.
Ganweriwala – An important but less excavated site in Pakistan; no such inscription discovered.