Solve the Formula for the Specified Variable $A = \frac { 1 } { 2 } h ( a + b ) \quad$

Multiple Choice

Solve the formula for the specified variable.
- $A = \frac { 1 } { 2 } h ( a + b ) \quad$ for $a$

A) $a = \frac { h b - 2 A } { h }$
B) $a = \frac { 2 A - h b } { h }$
C) $a = \frac { A - h b } { 2 h }$
D) $a = \frac { 2 \mathrm { Ab } - \mathrm { h } } { \mathrm { h } }$