The number of stomata and epidermal cell in $ 1 mm^2$ area of abaxial surface of the leaves of A, B , C and D plants are given below. Identify the plant having the least stomatal index :

Question

Plant	Number of stomata	Number of epidermal cells
A	20	100
B	40	160
C	50	300
D	70	560

The correct answer is

$\begin {array} {1 1} (1)\;B & \quad (2)\;C \\ (3)\;D & \quad (4)\;A \end {array}$