ANSWER
A. 5 units
Step-by-step explanation
The distance between two points (x₁, y₁) and (x₂, y₂) is given by the Pythagorean Theorem,
![d=\sqrt[]{(x_1-x_2)^2+(y_1-y_2)^2}](https://img.qammunity.org/2023/formulas/mathematics/college/87agft4bkj7u5ow4h8vn3yzn1g00q311fw.png)
In this case, the points are (4, 3) and (1, -1). The distance between them is,
![d=\sqrt[]{(4-1)^2+(3-(-1))^2}=\sqrt[]{3^2+(3+1)^2}=\sqrt[]{3^2+4^2}=\sqrt[]{9+16}=\sqrt[]{25}=5](https://img.qammunity.org/2023/formulas/mathematics/college/ah2csqd6ep5ts4jvwpdc9he6656xkacejw.png)
Hence, the distance between the given points is 5 units.