The notion of kingship projected by the Kushana rulers is best evidenced through which of the following?

The correct answer is Coins and sculpture.

Note: The original question contains a typo; the word should be "kingship" rather than "kinship".

The Kushana rulers projected their notions of kingship and divine authority predominantly through their physical legacy, specifically through their coins and sculptures:

• Coins: Kushana coinage frequently depicted rulers with divine attributes, such as a nimbus (halo) around the head or flames emerging from their shoulders. They also adopted grand titles like Devaputra (Son of God).
• Sculpture: Colossal statues of Kushana kings, such as Kanishka, were installed in dynastic shrines (devakulas) at places like Mat near Mathura and Surkh Kotal in Afghanistan. Placing these royal statues in shrines projected the king as a god-like figure worthy of veneration.

While identifying with deities was the underlying strategy to legitimize their rule, the tangible evidence through which this concept was best projected to the public was their numismatic and iconographic artifacts.