Use Scientific Notation to Perform the Following Operations $\left( 5 \times 10 ^ { - 3 } \right) \div \left( 10 \times 10 ^ { - 4 } \right)$

Multiple Choice

Use scientific notation to perform the following operations. Leave your answer in scientific notation.
- $\left( 5 \times 10 ^ { - 3 } \right) \div \left( 10 \times 10 ^ { - 4 } \right)$

A) $2.0 \times 10 ^ { 7 }$
B) $2.0 \times 10 ^ { 1 }$
C) $5.0$
D) $5.0 \times 10 ^ { 6 }$