The answer you are looking for is "cardiac sphincter".
Varied amounts is a good bet. You have a certain amount to pay for objects and bills also have amounts so is easier.
Durable is also good but money can be regained by the bank or job.
Portable is also good but in other times people paid with gold bars which were quiet heavy.
Limited Supply is not it because you need it. So factories keep on producing.
Pretty sure its B, the right to punish writings criticizing the government
Total distance ÷ elapsed time =Average speed
