A the answer is A I believe
A pentatonic scale is a musical scale with five notes per octave, in contrast to the more familiar heptatonic scale that has seven notes per octave (such as the major scale and minor scale).
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Lines are used to create shape, pattern, texture, space, movement and optical illusion in design. The use of lines allows artist to demonstrate delicacy or force. Curves may take us slowly uphill, or turn sharply twisting our mind as they turn. a line can express various moods and feelings.
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The subject of a talk, a piece of writing, a person's thoughts, or an exhibition; a topic.