What Was the Basic Premise of What Was Called the "Mind

What was the basic premise of what was called the "mind cure" movement, also known as the "new thought" movement?

A) that chemical imbalances in the brain created psychological disturbances
B) that physical healing resided in a person's mental powers
C) that mental illness, like physical illness, was the result of medical causes
D) that spirituality was the key to good physical health