(B) The smallest prime number is $2$.The smallest composite number is $4$.To find the $LCM(2, 4)$:Prime factorization of $2 = 2^1$.Prime factorization

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(B) The smallest prime number is $2$.The smallest composite number is $4$.To find the $LCM(2, 4)$:Prime factorization of $2 = 2^1$.Prime factorization of $4 = 2^2$.$LCM$ is the product of the highest power of each prime factor involved,which is $2^2 = 4$.Therefore,the $LCM$ is $4$.