A standard Argo float, a type of autonomous robot, measures temperature and salinity in the upper regions of ice-free oceans. More advanced floats can measure a wider range of ________ and monitor seasonal ice zones.

Which choice completes the text so that it conforms to the conventions of Standard English?

Question

Accepted Answer

variables, travel to greater depths,

Answer

variables: travel to greater depths

Answer

variables travel to greater depths,

Answer

variables, travel to greater depths;