Upgrade subject to access all content

Which one of the following is closest to the amount of force that the atmosphere exerts on an area of $3{ km }^{ 2 }$ at sea level?

$3\times { 10 }^{ 3 }\quad N$

$3\times { 10 }^{ 5 }\quad N$

$3\times { 10 }^{ 8 }\quad N$

$3\times { 10 }^{ 11 }\quad N$