alleryWhich kind of conservation do children usually master last?
ANumber
BMass
CVolume
DWeight
Answer & Solution
Correct answer: C. Volume
1. Conservation does not arrive all at once; different quantities are conserved at different ages.
2. Number is usually conserved by about 6 to 8 years.
3. Mass and length come at about 7 years.
4. Weight comes at about 9 years.
5. Volume comes last, at about 11 years.
6. So volume is mastered last.
**Why the other options fail:**
- Weight is the close trap (about 9), but it still comes before volume.
- Number and mass come earlier still.
_Source: Wikipedia, "Conservation (psychology)", section "Age" (revision 1351958246)_
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