Patty melt's desk has become so cluttered that it takes time for her to find important papers. after several incidents in which she suffered the consequences of not finding the paper in time, she learned to organize and straighten her desk. patty learned this behavior through which operant conditioning procedure

The correct answer is negative reinforcement. 

Negative reinforcement (NR) refers to a principle in operant conditioning whereby a behavior or response is strengthened or reinforced because it eliminates or removes a negative consequence or stimulus. In this instance, Patty learned to organize her desk because it eliminates or removes the negative consequence of taking a long time to find important papers.