Solve the Equation for the Indicated Variable $P = \frac { A } { 1 + r t } \quad$

Multiple Choice

Solve the equation for the indicated variable.
- $P = \frac { A } { 1 + r t } \quad$ for $r$

A) $r = \frac { P - 1 } { \text { At } }$
B) $r = \frac { A - P } { P t }$
C) $r = P - A t$
D) $r = \frac { P - A } { 1 + t }$