【单选题】

Manipulation of the spinal column, massage, and dietary adjustments ______ used in chiropractic therapy.
A．(the principal methods are

B．(are the principal methods
C．(how are the principal methods
D．(are there the principal methods

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根据网考网移动考试中心的统计，该试题：

10%的考友选择了A选项

86%的考友选择了B选项

1%的考友选择了C选项

3%的考友选择了D选项

Manipulation of the spinal column, massage, and dietary adjustments ______ used in chiropractic therapy.A．(the principal methods are