Agirl learns that whenever her brother shares his cookie with her, her mother gives him a piece of candy. the girl starts sharing her treats with her friends when they come over in the hopes of getting a similar reward. the girl's learning to share is an example of

- The answer is Observational learning.

- Observation learning occurs when someone attends situation with someone else and learn the consequences of this performance and learn to do it if it receives positive consequences and learns to not to do this work if it receives negative consequences. 

- The Observation learning depends on the repetition of a specific work or behave and another person attends to see the consequences and start to be motivated to do the same to get the same reward or avoiding this doing to avoid the bad consequences.

- Examples:
1- Like when your co-worker fired for being late many times, so the new employee starts to come at his time.
2- when a child wrote on the wall and his mother punish him, his little sister never do the same to avoid the punishment.

- On our question, the girl does the same doing of her brother to get the reward from her mother like her brother.

Ithink it would be choices a and b. hope this !