(B) By definition, $1 \text{ } \mathring{A} = 10^{-10} \text{ m}$. To convert this into millimeters $(\text{mm})$, we know that $1 \text{ m} = 10^3 \t

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(B) By definition, $1 \text{ } \mathring{A} = 10^{-10} \text{ m}$. To convert this into millimeters $(\text{mm})$, we know that $1 \text{ m} = 10^3 \text{ mm}$. Therefore, $1 \text{ } \mathring{A} = 10^{-10} \times 10^3 \text{ mm}$. $1 \text{ } \mathring{A} = 10^{-7} \text{ mm}$. Thus, the correct option is $B$.