Mentally Simplify the Quotient Without a Calculator $\left( 1.4 \times 10 ^ { - 30 } \right) \div \left( 7 \times 10 ^ { - 10 } \right)$

Multiple Choice

Mentally simplify the quotient without a calculator. $\left( 1.4 \times 10 ^ { - 30 } \right) \div \left( 7 \times 10 ^ { - 10 } \right)$

A) $2 \times 10 ^ { - 21 }$
B) $2 \times 10 ^ { - 20 }$
C) $2 \times 10 ^ { - 19 }$
D) $2 \times 10 ^ { - 40 }$
E) $0.7 \times 10 ^ { - 20 }$