Three of the following are examples of learning. which one is not?
abigail cries when she steps on a sharp pebble.
after many hours of heated debate, brian begins to advocate political practices he has previously opposed.
cara suddenly recognizes how the division fact “24 ÷ 4 = 6” is related to the multiplication fact “6 x 4 = 24.”
david has been running away from german shepherds ever since he was bitten by a german shepherd two years ago.

Abigail cries when she steps on a sharp pebble.

Explanation:

This is a direct consequence. Abigail stepped on a sharp pebble, making her hurt her foot. The pain is most likely what triggered this reaction of crying. This option doesn't reveal anything about learned behavior or new knowledge. It just describes the consequence of an act.

answer; /// the answer to the first question is (b) it began when people first deliberately seeds; /// and (d); // it gave people a steady food supple for the first time;