Solve for the Indicated Variable $\frac { 1 } { \mathrm {~A} } = \frac { 1 } { \mathrm {~m} } + \frac { 1 } { \mathrm { t } }$

Multiple Choice

Solve for the indicated variable.
- $\frac { 1 } { \mathrm {~A} } = \frac { 1 } { \mathrm {~m} } + \frac { 1 } { \mathrm { t } }$ , for $\mathrm { t }$

A) $t = \frac { m - A } { m A }$
B) $t = 1 + \frac { m A } { m - A }$
C) $t = 2 - \frac { m A } { m - A }$
D) $t = \frac { m A } { m - A }$