Multiply the Radical Expressions $( \sqrt { 7 x - 3 } + 4 ) ^ { 2 }$

Multiple Choice

Multiply the radical expressions. $( \sqrt { 7 x - 3 } + 4 ) ^ { 2 }$

A) $7 x + 4 \sqrt { 7 x - 3 } + 13$
B) $7 x + 8 \sqrt { 7 x - 3 } + 13$
C) $7 x + 13$
D) $7 x + 1$