The powerful king(s) of the Kushanas is/are

Kanishka
Huviska
Both (A) and (B)
None of them

The correct answer is: Both (A) and (B).

Kanishka was the most powerful king of the Kushan Empire. He ruled from around 127 to 150 CE. He was a great conqueror and expanded the Kushan Empire to its greatest extent. He was also a patron of Buddhism and Hinduism.

Huvishka was the son of Kanishka. He ruled from around 150 to 180 CE. He was a successful ruler and continued the expansion of the Kushan Empire. He was also a patron of Buddhism and Hinduism.

Both Kanishka and Huviska were powerful kings who made significant contributions to the Kushan Empire. They were both patrons of Buddhism and Hinduism, and they both expanded the empire to its greatest extent.