(B) For any positive integer $n \geq 1$,the expression $10^{n}$ can be written as $10 \times 10 \times 10 \times \dots \times 10$ ($n$ times).Since $1

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(B) For any positive integer $n \geq 1$,the expression $10^{n}$ can be written as $10 \times 10 \times 10 \times \dots \times 10$ ($n$ times).Since $10^{1} = 10$,$10^{2} = 100$,$10^{3} = 1000$,and so on,it is evident that every power of $10$ ends with the digit $0$.Therefore,the last digit of $10^{n}$ is $0$.