Question

Measuring the size of a specific object might include which pair of SI units? A. gram, second B. candela, mole C. kilogram, ampere D. meter, kilometer

Answer 1

Answer: D. meter, kilometer
SI or "International System of Unit" is the unit that used in the international organization to make counting easier.

In this case, all of the options are base SI but if you compare them both they are a different unit that can't be converted each other. You can't convert gram into second.
Only option D. meter, kilometer is had the same unit that can be converted.