Which law of adult learning theorized by Professor Edward Thorndike suggests that habits and memories used repeatedly are strengthened and habits not reinforced are weakened?

The correct choice is founded on the principle known as the "law of disuse," which is a key concept articulated by Professor Edward Thorndike. This law posits that behaviors or habits that are practiced and reinforced over time become stronger and more ingrained, while those that are not frequently used tend to fade away or weaken over time. This is particularly relevant in adult learning, as it emphasizes the importance of consistent practice and reinforcement in retaining skills and knowledge.

In instructional contexts, recognizing this principle can help educators design learning experiences that encourage regular engagement and application of skills, thereby solidifying the learners' abilities. The law of disuse highlights the need for ongoing practice and reinforcement in order to achieve effective learning outcomes and to maintain previously acquired knowledge and skills.