Arson is the intentional ignition that indicates that it is known to cause damage to others or the country, to collective property, or to threaten the lives of others. Which of the following acts is arson? ["Zhang was dissatisfied with the director's deduction of the bonus and secretly set fire in the kitchen of the director's house one evening. Fortunately, he was found and failed.", "Li tortured the other party's letter at home.", 'Gao went to the theater and accidentally threw a cigarette butt on the sofa causing a fire.', 'Bao felt unbearable. He was filled with gasoline and set himself on fire in the downtown area.']