Final answer:
Jane's experience with being ridiculed for her shirt choice and adjusting her behavior as a result is an example of a social sanction, illustrating how social norms are enforced through reactions of others.
Step-by-step explanation:
Jane being ridiculed at school for wearing a "dorky" shirt and now choosing not to wear it anymore is an example of a social sanction. This term refers to the reactions of individuals and groups that enforce conformity to norms and expectations. In this case, Jane altered her behavior to avoid ridicule, demonstrating how negative sanctions can influence personal choices and enforce social norms.