What Is the Correct Ground State Electron Configuration of Boron $1 s ^ { 2 } 2 p ^ { 3 }$

Multiple Choice

What is the correct ground state electron configuration of boron, which has 5 electrons?

A) $1 s ^ { 2 } 2 p ^ { 3 }$
B) $1 s ^ { 2 } 1 p ^ { 2 } 2 s$
C) $1 s ^ { 2 } 2 p ^ { 2 } 3 s$
D) $1 s ^ { 2 } 2 s ^ { 2 } 2 p$
E) $1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 3 }$