Answer:
D. time management
Explanation:
Lifelong learning is a term used to describe the need for human beings to be studying throughout their lives. This study is done to perfect a skill we already have or to discover and learn new things. Lifelong learning has been a challenge to the lives of many adults. This is because adulthood is accompanied by many responsibilities that require a great deal of people's time. As a result, the time available for an adult person to study is reduced and ends up demotivating many people. For this reason, we can conclude that the most common challenge to lifelong learning is time management.
