question: time:seconds
choices.label: A B C D
choices.text: mass:kilograms area:kilometers volume:infinite volts:voltage
explanation: the unit of measurement for "time" is "seconds". the unit of measurement for "mass" is "kilograms". the unit of measurement for "area" is not "kilometers", but the unit of measurement for length is "kilometers". "infinite" describes an extremely large number, not a unit of measurement. The unit of measurement of "voltage" is "volt". The unit of measurement of "volt" is not "voltage".