1.) Which of the images a,b,c,or,d are lines?
I don't think that any of the examples are lines. They all look to contain mass and volume.

2.)Which of the images a,b,c,or d are shapes?
All of these images are shapes. They all expand and look as if they contain mass and look solid.

3.)What makes a line?
A line is a series of dots. A line dose not have mass,

4.) What is a shape?
A shape is a solid mass. It can be held and thouched. They are made up of lines that are conected.