This is a test of commonsense with single/multi-choices. Complete the next sentence:

A single hand of an artist is painting a picture on canvas. With delicate strokes, the images of green are seen. with more work

Choices:
a). to do, the brush finally touches the canvas..
b). , the image begins to take shape in that of a flower..
c). , the brush is combined with the paint to create a more complete picture..
d). , the image becomes taller, as a large waterfall is shown..
The answer is:
b).