When Graham Uses the Printer in the Library,the Paper Keeps

Multiple Choice

When Graham uses the printer in the library,the paper keeps jamming in the machine.He takes the paper out of the paper tray,fans it,and then flips it over,so the other side of the paper feeds first.This is the way he solves similar problems on the photocopy machine at the office where he works.Which problem-solving heuristic is consistent with Graham's method of solving the problem

A)  working backward 
B)  searching for analogies 
C)  means-end analysis 
D)  trial and error