Solve Express the Result in Scientific Notation $9.11 \times 10 ^ { - 28 }$

Multiple Choice

Solve. Express the result in scientific notation. Round to the nearest hundredth, if necessary.
-The mass of a neutron is approximately $9.11 \times 10 ^ { - 28 }$ grams. Find the mass of 424,000,000 neutrons.

A) $3.86 \times 10 ^ { - 18 } \text { grams }$
B) $3.86 \times 10 ^ { - 20 } \text { grams }$
C) $3.86 \times 10 ^ { - 17 } \text { grams }$
D) $3.86 \times 10 ^ { - 19 } \text { grams }$