The correct expression of partial pressure in terms of mole fraction is
A. `p_(1) = x_(1) p_("total"), p_(2) = x_(2)P_("total")`
B. `P = x_(1) x_(2) x_(2) P_("total")`
C. `P_("total") = P_(1) x_(1) , P_("total") = P_(2) x_(2)`
D. `P_(1) + P_(2) = x_(1) + x_(2)`