Question

select the best detail to show a ten - pound weight has more mass than a five - pound weight.
mass is the amount of matter (or \stuff\) that makes up an object. mass can be measured by weighing objects—heavier objects have more mass. often, larger objects have more mass than smaller objects, but mass is not the same as size. a big box of air has less mass than a small box of bricks because there is more matter in the small box of bricks.
from jason chin, gravity. copyright 2014 by roaring brook press

Explanation:

The text states that heavier objects have more mass, and a ten-pound weight is heavier than a five-pound weight. This directly connects the greater weight to greater mass.

Answer:

"Heavier objects have more mass" (this detail, paired with the fact that a ten-pound weight is heavier than a five-pound one, shows the ten-pound weight has more mass)