Answer:
C
Explanation:
Let's find the area of each of the two circles.
First Circle:
The first circle has a diameter of 10 inches. That means the radius is 5 inches. So, its area is:
![A=\pi r^2\\A=\pi (5)^2\\A=25\pi](https://img.qammunity.org/2021/formulas/mathematics/high-school/n13eu7fcuotlbrc7b0j6ei1n55d9ixvmo8.png)
Second Circle:
The second circle has a diameter twice that of the first. So, the diameter is 20 inches. This means that the radius is 10 inches. Find the area:
![A=\pi r^2\\A=\pi (10)^2\\A=100\pi](https://img.qammunity.org/2021/formulas/mathematics/high-school/mda6094un42nv1djna3rsvdwcuwbs8jhd0.png)
Now, find the ratio between them by dividing:
![\frac{\text{Smaller}}{\text{Larger}}=(25\pi)/(100\pi)](https://img.qammunity.org/2021/formulas/mathematics/high-school/1fwzmufgw68aymlaah04umtos5e7dz1azj.png)
Simplify:
![\frac{\text{Smaller}}{\text{Larger}}=(1)/(4)](https://img.qammunity.org/2021/formulas/mathematics/high-school/p5gh4kew52htroh0vzmz6qyp0nao6qlhrx.png)
1/4 is the same as 1:4
So, our answer is C :)