Proof of Work (PoW) vs. Proof of Stake.

Proof of Work (PoW) vs. Proof of Stake.
A . PoW is computationally intensive which requires lots of energy. On the other hand, miners earn straightforward a reward for mining a block and incorporating transactions.
B . PoW is better than PoS, because with PoS we increase the amount of energy spent on the network.
C . PoS is mining with specialized new hardware that has to be purchased with a stack of Ether in the network. Hence the Name: Proof of Stake, which derives from Stack.

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Answer: A