A、Because he forgot one of his suitcases. B、Because he was suspected of carrying something dangerous. C、Because he wanted to go

I had spent my last day in London visiting friends, taking pictures, and doing some last-minute shopping. Among other things, I had bought some presents: a shirt for my brother, a woollen blanket for my sister, and a battery-powered alarm clock for my father.
    After a tiring journey, I was glad to be sitting in the plane at last. In a few minutes we would soon be up in the sky on our flight to Berlin.
    But ten minutes later, instead of enjoying the beauty of the evening sky from high above the clouds, I was sitting in a smoke-filled room with an airline official and a police officer at my side. On the table in front of me was one of my suitcases. The official asked me to show them my passport, my ticket, and my baggage check. Then I was requested to open the suitcase and to spread out its contents on the table.
    I did as I was told. The moment I placed the alarm clock on the table, the two officials looked at each other and smiled.Hearing the clock ticking away merrily, I suddenly understood. Someone must have heard the ticking noise coming from my suitcase and thought there was a time bomb hidden in it.