The answer is B, 4.1 units.
To solve this problem, we can use the distance formula. The distance formual states that the distance between two points, (x₁, y₁) and (x, y) is:

Now we can substitute the values of the points (-3, 3) and (1, 2) and solve. The expression become:
=
=
=
=

Rounded to the nearest tenth, the square root of 17 is 4.1, meaning that the answer is B, 4.1 units.