Mentally Approximate the Product Without a Calculator $\left( 6 \times 10 ^ { 14 } \right) \left( 3 \times 10 ^ { 20 } \right)$

Multiple Choice

Mentally approximate the product without a calculator. $\left( 6 \times 10 ^ { 14 } \right) \left( 3 \times 10 ^ { 20 } \right)$

A) $18 \times 10 ^ { 50 }$
B) $18 \times 10 ^ { 35 }$
C) $9 \times 10 ^ { 34 }$
D) $1.8 \times 10 ^ { 33 }$
E) $1.8 \times 10 ^ { 35 }$