Line... or is it Shape?

1) Which of the images a, b, c, or d are line?
--Mostly A, and B. Though in a way all can be lines, C that seems like a shape can be interpreted as really short and thick line.
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2) Which of the images a, b, c, or d are shapes?
--Again, all can be examples of shape as well as line. A and B may seem more like lines, but the first can be seen as a triangle, and B can be a more swirled creative shape.
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3) What makes a line?
--What makes a line can be the way it is formed to seem infinite, or finite, but doesn't connect to it.
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4) What makes a shape?
--The deference between shapes and lines can be the way shape is whole or is what line can create when lines connect.