[单选题]
A primary alcohol is heated under reflux with cvrr68ps znsigc-i/kx. -0 lzz.35zean aquy) (abr0,x gy/ r)amwvro1u0keous solution of the oxidizing agent)yo0y0axagr/u,1) mvr k(w rb $KMnO_4$Which of the following is a possible product of this reaction?