The formula for the Laspeyres price index is (o is the base year and n is the given year) ?
A. P = ∑Poqo/∑poqo
B. P = ∑Poqo/∑pnqn
C. P = ∑Pnqo/∑poqo
D. P = ∑Poqn/∑poqo