In case the price (P), quantity (Q), and changes (?) are represented by respective symbols given in the brackets, the price elasticity ofdemand (Ed) is measured by

A. $${E_d} = \frac{{\Delta Q}}{{\Delta P}}$$

B. $${E_d} = \frac{{\frac{{\Delta Q}}{Q}}}{{\frac{{\Delta P}}{P}}}$$

C. $${E_d} = \frac{{\Delta P}}{{\Delta Q}}$$

D. $${E_d} = \frac{{\frac{{\Delta P}}{P}}}{{\frac{{\Delta Q}}{Q}}}$$

Answer: Option B