Q: Consensus mechanism used in bitcoin is ____________.  

Answer: B

The consensus mechanism used in Bitcoin is Proof of Work (PoW).

PoW is a consensus mechanism that requires miners to solve complex mathematical problems in order to add new blocks to the blockchain. The miners who solve the problems first are rewarded with newly minted Bitcoin as well as transaction fees. The PoW mechanism ensures that transactions on the network are verified and confirmed by a decentralized network of participants, and it provides security against attacks by making it computationally difficult and expensive to reverse transactions or manipulate the blockchain. However, PoW also requires a significant amount of computational power and energy consumption, which has led to concerns about the environmental impact of Bitcoin mining.

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