Answer:
Option 3
Step-by-step explanation:
For Option 1;
The ratio of string instruments to percussion instruments is as shown below;
![\begin{gathered} (2)/(3)=(2)/(3) \\ (4)/(6)=(2)/(3) \\ (6)/(9)=(2)/(3) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/hi97sqlpmcdwpfj9lyj422rytiqm8ts68f.png)
We can see that the constant of proportionality isn't 2 so this is not the correct option.
For Option 2;
The ratio of string instruments to percussion instruments is as shown below;
![\begin{gathered} (2)/(5)=(2)/(5) \\ (4)/(10)=(2)/(5) \\ (6)/(15)=(2)/(5) \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/yd2v73oq0ldo0f0ewg2i0sm9g1nm2fat5e.png)
We can also see that the constant of proportionality isn't 2 so this is not the correct option.
For Option 3;
The ratio of string instruments to percussion instruments is as shown below;
![\begin{gathered} (2)/(1)=2 \\ (4)/(2)=2 \\ (6)/(3)=2 \end{gathered}](https://img.qammunity.org/2023/formulas/mathematics/high-school/ka9ea83gykb7mboksxt0y85s3sfa40seym.png)
We can see from the above that the constant of proportionality is 2 so this is the correct option