Yoga and back pain

yoga combines postures and breathing exercises to revive the mind and body. current research suggests that carefully adapted yoga poses reduce lower back pain.
yoga is the sixth most commonly used complementary health practice among adults. in one study of 90 people with lower back pain, those practicing yoga had significantly less disability and recurring pain after six months. conclusions from another 2011 study of 313 adults with recurring lower back pain suggested that 12 weekly yoga classes resulted in better function than medical care.
many back patients agree that medical treatment is unnecessary, and people are sometimes misadvised by doctors. in fact, many claim that yoga alone is enough to reduce pain symptoms. it stretches the whole body and targets core muscles for long-lasting strength.

1
what is the central idea of the passage?
a.
many people doubt whether yoga is as beneficial as many claim it is, so scientists have been conducting studies to prove its effectiveness.
b.
while yoga is generally known as a meditative exercise for the mind and body, there are also health benefits that result from the practice.
c.
although yoga has been proven to those with health issues, there is still not enough evidence to prove it is better than medical treatment.
d.
yoga cure lower back pain, but there is no other type of bodily pain that