Question 9 is based on the following graph 9.Which of the following， if true， contributes most toan explanation of the change in ice cream sales？ （A）Because of low demand for its transcontinental flights departing from the airport， one airline ceased offering such flights as of December 31，1993. （B）There were fewer airline passengers who were traveling to destinations outside the United States in January1993 than there were in anuary1992 （C）The average daily number of passengers at the airport in the month of January was the same for each of the three years （D）In January 1993 a blizzard forced all flights out of the airport to be canceled for three days， stranding many passengers at the airport. （E）There were five percent fewer commuter flights scheduled to depart from the airport in January 1993 than there were in January of either 1991 or 1992 10.People whose bodies cannot produce the substance cytochrome P450 are three times as likely to develop Parkinson’s disease， a disease that affects the brain， as are people whose bodies do produce this substance. Since cytochrome P450 protects the brain from toxic chemicals， toxic chemicals probably play a role in the development of Parkinson’s disease. Which of the following， if true， most strongly supports the argument？ （A）It will soon be possible for cytochrome P450 to be synthesized for the treatment of people whose bodies cannot produce this substance. （B）Many people whose bodies are unable to produce cytochrome P450 lack the ability to produce certain other substances as well. （C）Cytochrome P450 has no effect on the brain other than to protect it from toxic chemicals. （D）People with Parkinson’s disease often exhibit a marked lessening in the severity of their symp- toms when they are treated with dopamine， a chemical produced naturally in the brain. （E）Many people with Parkinson’s disease have the ability to produce cytochrome P450 naturally.