The Difference Between Concentrative Meditation and Mindfulness Meditation Is

The difference between concentrative meditation and mindfulness meditation is:

A) mindfulness meditation requires you to focus on mental images, whereas concentrative meditation requires you to concentrate on external objects
B) mindfulness meditation involves listening to free-flowing thoughts without responding; concentrative meditation focuses attention on mental images or one particular thing
C) concentrative meditation focuses the mind toward one thing; mindfulness meditation eliminates all thoughts during meditation
D) concentrative meditation focuses the mind toward one thing; mindfulness meditation focuses on answering ongoing thoughts