What is one of the main concerns governments have about Bitcoin? a. Governments worry that Bitcoin may undermine traditional banking systems and financial institutions b. The lack of transparency and anonymity may facilitate illegal activities such as money laundering and tax evasion c. The complex technology behind Bitcoin may be difficult for governments to regulate effectively d. Its limited availability and scarcity may lead to deflationary pressures on the economy e. Bitcoin's decentralized nature may lead to the concentration of power in the hands of a few large miners