(C) To find the $LCM$ of $40, 60,$ and $80$,we first find the prime factorization of each number:$40 = 2^3 \times 5^1$$60 = 2^2 \times 3^1 \times 5^1$

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(C) To find the $LCM$ of $40, 60,$ and $80$,we first find the prime factorization of each number:$40 = 2^3 \times 5^1$$60 = 2^2 \times 3^1 \times 5^1$$80 = 2^4 \times 5^1$The $LCM$ is the product of the highest power of each prime factor present in the numbers:$LCM = 2^4 \times 3^1 \times 5^1$$LCM = 16 \times 3 \times 5$$LCM = 16 \times 15 = 240$