In a Study Examining Brain Differences Between Practitioners of Meditation

In a study examining brain differences between practitioners of meditation and those who never meditated, MRI scans showed that:

A) several cortical areas were thicker in the meditators' brains than in the nonmeditators.
B) several cortical areas were thinner in the meditators' brains than in the nonmeditators.
C) the meditators had less gray matter in regions associated with attention, emotion, and sensory processing.
D) meditators and nonmeditators have identical brains.