can everyone explain me why

Which of the following is correct about cryptocurrency? O A. The energy cost of bitcoin mining needs to be put into perspective with the costs running a centralized system for traditional currencies. O B. The energy cost of bitcoin mining is a pure waste which is not necessary for the funtioning of bitcoin. O C. Contrary to traditional currencies that suffer from inflation, bitcoin value is stably constant over time. O D. Blockchain is an application built on the bitcoin