in robert rauschenberg's combine painting the bed, he uses a(n) as his canvas

The correct answer would be a quilt and a pillow.

Combine painting is a special form of painting where various objects are used and incorporated into the canvas itself. Thus, the final piece is a unique mix of a painting and a sculpture. Robert Rauschenberg is the one who coined the term and in his piece the Bed he used a quilt and a pillow.

B. is the correct answer.

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