What are the advantages of using kilogram as a standard unit over the local unit of mass

it's more efficient

Explanation:

its more efficient and and a lot of people use it

answer:   you might love summer weather, but you don’t want it to feel like the sun is inside your car. but a hot car that just won’t seem to cool down might be a bigger of a problem than you think. your car relies on being at the right temperature.

explanation:

real, smaller and upside-down.   so the answer should be b.