Critical Reasoning (CR) | Researchers have shown that older ants, which usually spend more time

Researchers have shown that older ants, which usually spend more time gathering nourishment for the colony, tend to have larger brains than do younger ants, which usually help nurture ant larvae in the colony. Since gathering nourishment requires greater cognitive skills than does nurturing larvae, it would appear that such gathering leads to the increased brain size of older ants.

Which of the following, if true, most seriously weakens the argument above?

A. Ants that have spent more time gathering
...

---