单项选择题

A man shot Martin Luther King in Atlanta on 4th April, 1968. He drove a white Ford car. Who was he.’ The police found "Harvey Lowmeyer’s" gun and "John Willard’ s" shirt, and then the white car. It was "Eric Starvo Galt’s’ ’’ car. So what was this man’s real name Marks on the car were sent to Los Angeles. 300 detectives questioned people. At last one found a photograph of "Galt". Then detectives in Atlanta found a fingerprint. It was on a map in "Galt’s" room in a small hotel. One fingerprint was enough. James Earl Ray’s fingerprints were already on the F. B. I. (联邦调查局) cards. The police watched railway stations, hotels and airport. 3,000 detectives were trying to find Ray, yet things went unsuccessfully. The Canadian police were helping too. They looked at 24,000 photographs in their Passport Office. Then they found one of "Ramon George Sneyd ", "We gave this man a passport last month," they said, "He went to London on 2nd May." The man was wearing thick glasses but the London Airport saw Sneyd’s name on a passenger list. It was the end of the biggest man-hunt in history. The F. B. I. spent 1.4 million dollars, but they got their man.

Which of the following is the most important key that helped to find the murdered ().

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