Volume index in Marshall is _______________?

A. ?pn(qo + qn)/?pn

B. ?pn(Po + Pn)/ ?pn (Po + Pn)

C. ?qn(qo + qn)/?qn(po + pn) x100

D. ?qn(Po + Pn)/ ?qo (Po + Pn) x100
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