Answer:
Option C.
Explanation:
To find the trend of adoption of the animals by the zoo we will find the slope of line given in each graph.
For graph B.
Given line is passing through two points (0, 3) and (2, 15)
Slope of the line
![m_(A)=(15-3)/(2-0)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/c9kgvocoeme5lghji26uxs19p0uxnrepaq.png)
For graph C.
Given line is passing through (0, 12) and (4, 0)
Slope of the line in graph
![m_(B)=(0-12)/(4-0)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/qet71hxpo86s8lci29ai38gzql539x6iw6.png)
![m_(B) =-(12)/(4)=(-3)](https://img.qammunity.org/2020/formulas/mathematics/middle-school/dy51skpas0py7cl0l9u0s03jvr7u2aay5k.png)
In these two lines, line in graph C is showing negative slope which means adoption of animals by zoo is showing negative trend.
So Option C. is showing the slowest rate at which the animals in the zoo were adopted.