The teacher of yoga said that he knows how good the yoga exercises feel and how beneficial
A.The teacher benefits by the teaching of yoga and so, as a beneficiary, is not a disinterested witness.
B.The practice of yoga has changed somewhat over three thousand years.
C.The teacher cites the experience of only one person, whose well-being might be due to other causes.
D.War, which cannot on balance be called sound, has lasted the length of human history.
E.Three thousand years is an underestimate of the time period.