Which of the following cryptocurrencies use an alternate consensus method called "Scrypt" to BTC's Proof of Work (POW) SHA-256 algorithm?

Which of the following cryptocurrencies use an alternate consensus method called "Scrypt" to BTC’s Proof of Work (POW) SHA-256 algorithm?

Which of the following cryptocurrencies use an alternate consensus method called "Scrypt" to BTC’s Proof of Work (POW) SHA-256 algorithm?
A . Ripple
B . Peercoin
C . Litecoin
D . Steemit

Answer: C

Explanation:

The Scrypt hash function was initially implemented by the Litecoin development team to avoid what are known, ASICs, from being able mine its cryptocurrency. When mining for cryptocurrencies, users typically have an option between: a CPU, GPU or ASIC miner.