Some people who have treated Bitcoin as the medium of exchange it's supposed to be have stolen significant quantities of Bitcoin from e.g. Silk Road customers, and hackers have also stolen quite a bit. Bitcoin could fade away into irrelevance as better, stronger, sounder, more easily anonymized cryptocurrencies replace it._______________the Holy Grail of Internet commerce in very cheap things - feasible and making borders economically superfluous.

Options

A. Bitcoins serve several vital functions: Not just protecting its users from government and private thievery, but also making "micropayments"
B. Cryptocurrencies serve several vital functions: Not just protecting their users from government and private thievery,but also making "micropayments"
C. Cryptocurrencies serve several vital functions : Not just protecting its users from government and private thieverym but also making "micropayments"
D. Cryptocurrencies serve several vital functions: Not just protect it's users from government and private thievery, but also make "micropayments"

Answer

B

Explanation

The singular countable noun .function. in option C and E follows the quantifier .several. , which requires a plural noun. The countable noun has to be in accordance with the plural noun, therefore , .functions. is the correct word thereby eliminating option C and E. The statement before the blanks state that bitcoins are being replaced by Crytocurrencies. Thus , the next statement states the positive aspect whic has to be of cryptocurrency is a system of digital money transaction so, the suitable pronoun is .they. not .it..