Why is balance of thick and thin lines necessary in a line border?

So the border stays attractive and does not overpower the main content

The governing concept is visual hierarchy through line-weight balance. A border is a supporting design element: it should frame, decorate, and define the edge of a page without competing with the picture, text, or central motif inside it. Combining thick and thin lines creates rhythm and emphasis, while controlled weight keeps the border attractive rather than visually overpowering. Therefore option A is correct. Option B is wrong because a well-designed border should not hide the main image. Option C is wrong because balance does not make the border disappear; it keeps it readable but subordinate. Option D is unrelated because drawn line thickness changes visual appearance, not the physical thickness of paper. The artist should also consider spacing, repetition, and the scale of the border in relation to the whole composition.

This is a Class 9 Art Education question. Chapter: Elements of Art. Topic: Line.