Autocad Which of the following objects with given thickness

Autocad - Which of the following objects with given thicknesses cannot be converted into a solid using the Convert to Solid tool?

Select one:

1. Rectangle

2. Line

3. Ellipse

4. Circle

Solution

The correct answer is 2. Line.

REGION is the command used to convert an object into a solid. (Objects may be a Rectangle, Ellipse or a Circle)

Moreover, only closed objects can be converted into a solid. A Line is not closed one.

So, I infer that even when thickness of a line is known it cannot be converted into a solid. Thank you.