Factor Out the Largest Possible Common Factor $$s \left( t ^ { 2 } - 7 \right) + 15 \left( t ^ { 2 } - 7 \right)$$

Multiple Choice

Factor out the largest possible common factor.
- $$s \left( t ^ { 2 } - 7 \right) + 15 \left( t ^ { 2 } - 7 \right)$$

A) $\left( \mathrm { t } ^ { 2 } - 7 \right) ( \mathrm { s } - 15 )$
B) $15 s \left( t ^ { 2 } - 7 \right)$
C) $\left( s ^ { 2 } - 7 s \right) + \left( 15 t ^ { 2 } - 105 \right)$
D) $\left( t ^ { 2 } - 7 \right) ( s + 15 )$