(D) The strength of a base is directly proportional to its dissociation constant $(K_b)$.Comparing the given $K_b$ values:$A: 3 \times 10^{-13}$$B: 4

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$C_6H_5NHC_2H_5$ $(K_b = 2 \times 10^{-9})$

(D) The strength of a base is directly proportional to its dissociation constant $(K_b)$.Comparing the given $K_b$ values:$A: 3 \times 10^{-13}$$B: 4 \times 10^{-11}$$C: 3 \times 10^{-12}$$D: 2 \times 10^{-9}$Since $2 \times 10^{-9}$ is the largest value among the given options,$C_6H_5NHC_2H_5$ is the strongest base.