You are given a sentence and a question. You're expected to write the correct answer based on the sentence.

Sentence: Jenny dropped a spool of thread and watched it roll rather quickly across the slick hardwood floor. She picked up the spool, then dropped it on the the textured rubber mat in the kitchen, which was rather rougher than the wood floor. The spool moved noticeably slower. Question: Which of the surfaces had the greatest amount of friction?
textured rubber mat