Answer:
The correct option is 4.
Explanation:
The volume of a cylinder is
![V=\pi r^2h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/2x6jh6ysz6ef85wkmp7armtq6fmfcdu3bh.png)
where, r is radius of the base and h is height of the cylinder.
It is given that the radius of the cylindrical sandbox is 2 ft and the volume of cylindrical sandbox is 18.84.
![[\because \pi=3.14]](https://img.qammunity.org/2020/formulas/mathematics/middle-school/em0u5kduy72a93xf2eabo08k3ty4bclndq.png)
![18.84=(3.14)* 4* h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/33e9hl0vurlp4ao1ahvubrpj7f8n6tzcfd.png)
![18.84=12.56* h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/3cfati0xs5jv7algltzeizpaohpraw8vs0.png)
![(18.84)/(12.56)=h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/6iejb3z0jsjklgvc2z16otx01tp3pdbhx9.png)
![1.5=h](https://img.qammunity.org/2020/formulas/mathematics/middle-school/s4tkxgwk7excunegnw17vvf87skbqgutq7.png)
The height of the sandbox is 1.5 ft. Therefore the correct option is 4.