A Barn Is an Atomic Unit of Area Equal to 10^-28

Multiple Choice

A barn is an atomic unit of area equal to 10^-28 m².What is the surface area of the Earth expressed in units of barn? Assume the Earth is a sphere with a radius of km.(The surface area of a sphere is 4πr².) ​

A) ​5.12 × 10⁴² barn
B) ​5.12 × 10^-20 barn
C) ​5.12 × 10³⁶ barn
D) ​5.12 × 10^-14 barn
E) ​5.12 × 10³⁰ barn