Find the Least Common Denominator of the Rational Expressions $\frac { 6 } { 6 y + 42 }$

Multiple Choice

Find the least common denominator of the rational expressions.
- $\frac { 6 } { 6 y + 42 }$ and $\frac { 3 } { y ^ { 2 } + 7 y }$

A) $6 y + 7$
B) $6 y ( y + 7 )$
C) $6 y ^ { 2 } + 7$
D) $6 y ^ { 2 } + 42$