SAT Question 02add2d2: Nonlinear Functions answer and explanation with Desmos solution

Choice B is correct. It's given that in January $2018$, there were $1,300$ customers subscribed to a company's newsletter and for the next $24$ months after January $2018$, the total number of customers subscribed to the newsletter each month was $7\%$ greater than the total number subscribed the previous month. It follows that this situation can be represented by the equation $c=a{\left(1+\frac{r}{100}\right)}^m$, where $c$ is the total number of customers subscribed to the company's newsletter $m$ months after January $2018$, $a$ is the number of customers subscribed to the newsletter in January $2018$, and the total number of customers subscribed to the newsletter each month was $r\%$ greater than the total number subscribed the previous month. Substituting $1,300$ for $a$ and $7$ for $r$ in this equation yields $c=1,300{\left(1+\frac{7}{100}\right)}^m$, or $c=1,300{\left(1.07\right)}^m$.