Read the following passage and questions, then choose the right answer from options, the answer should be one of A, B, C, D.

<passage>:
So I started going through the purse of the woman next to me. Perhaps the insides of things like purses and sealed boxes and locked drawers object with dust inside—a compact. Handkerchief, chewing gum, a small book, probably an address book, money in a change purse—a few bills and coins. Not much else. looking straight at me. I didn't want her to think I had taken it while she was out of the room, so I probed the contents of her purse, which she always kept in the upper right drawer of her desk. "It's in your purse," I blurted out. I was sent home with a stinging note. Since then I've kept quiet. At one time I assumed everybody was able the window. "Where are we?" she asked in a surprised voice. I told her luggage to another, looking for my beat-up suitcase. I went through slips and slippers, lingerie and laundry, a jig saw puzzle and a ukulele. I never did find my suitcase because I found the bomb first. The bomb was in a small bag—a woman's bag judging by the soft, flimsy things you'd never find in a man's—and I didn't know it was a bomb right away. I thought it was just a clock, one of those small, quiet alarms. I was going to pass it by and go on, but what held me My heart was beating in jackhammer rhythm my mouth was dry and my mind was numb. Tell somebody about the bomb before it's too late! No, they'd think I put it there. Besides, what good would it do? There would be the cellophane. I couldn't bear to watch her. I closed my eyes, forced my mind back to the luggage compartment, spent a frantic moment before I found the bag again. I had to stop that calling in ahead, but wouldn't that just bring suspicion, questions. Maybe I could convince them I could stop a clock—but not before the bomb exploded. And then what? My secret would be out and my life would be changed. I'd be a man not to be trusted, a prying man, a man literally with gimlet eyes. unconcernedly as they through the exit gate. I would have liked walking through the terminal and out the entrance and away, but I could not. I had my suitcase to get, for one thing. The damned bomb was the other. So I strolled out into the concourse again to look at the plane and watch the baggagemen at work, transferring the luggage to two airfield carts. They weren't as careful as I would have been. It was impossible to tell from this distance just which bag contained the bomb I could hardly identify my own scarred suitcase. The There was a flurry of ticket matching, hands grabbing for suitcases, and a general exodus on the part of my fellow passengers, too fast to determine who had got the one with the bomb. Now all that was left was the attendant and I had two bags—my own battered veteran of years, and a fine new red overnight case, small enough to be the one. I lit a cigarette, reached out. Inside were a woman's things and—a clock. The escapement was clicking vigorously. remaining bag. "One left over, eh?" "Yeah." He was so bored I was tempted to tell him what was in it. But he was eying me with a "well-why-don't-you-get-along?" look. "Take it inside. Why?" He was getting too curious. "Oh, I just wondered, that's all." "Cab?" I shook my head. "Just waiting." Just waiting for somebody to pick up a bomb. I lit another cigarette and glanced now and then toward the baggage claim area. The red bag was still there. All sorts of theories ran something very mundane, the matter of a printing order. But what could I do? If I left the airport, the attendant would eventually take the bag inside and there would be an explosion, and I wouldn't be able to live with myself. But he moved on down the steps, nodded at the redcap, and started across the street to the parking area. I could have called to him, "Hey, officer, let me tell you about a bomb in a little red bag." But I didn't. I didn't because I caught a movement at the baggage claim counter out of the side of my eye. to the rear of the air terminal. Picking up my own suitcase, I went inside in time to see him enter through a side door and deposit the bag "No. I'm waiting for someone." I turned my back to him, put down my suitcase, leaned against the escaped my grasp. "Do you have my suitcase?" I blinked my eyes open and looked around. The blonde in the plane stood there looking very fresh and bright and unconcerned. In her right hand case and set it on the scales. The girl thanked him, picked it up, glanced at me indifferently, and then started for the entrance with it. "Just a moment," I found myself saying, grabbing my bag and hurrying after her. from her and hurl it out through the doorway into the street, but I Over coffee I explained it all to her, how I had this extrasensory ability, how she was the first person I had ever revealed it to, and how I had discovered what was in her overnight bag. During the telling, her untouched coffee grew a skin, her face grew pale, her eyes grew less curious and more troubled. There were tears there when I finished. I asked her who put the bomb in her bag. "Joe did," she said in a toneless voice, not looking at me any more but staring vacantly across the room. "Joe put it there." Behind her eyes sister." Her smile was bleak. "I see now why he wanted to put in those books. I'd finished packing and was in the bathroom. He said he'd put in some books we'd both finished reading—for my sister. That's when he must have put the—put it in there." I said gently, "Why would he want to do a thing like that?" "I don't know." She shook her head. "I just don't know." And she was airport policeman. After I explained it to her, the girl—she said her name was Julia Claremont—agreed to tell him she thought there was a bomb in her bag, that she had noticed a ticking and had become worried because she knew she hadn't packed a clock. It wasn't good, but it would have to do. suitcase?" "Bag? Suitcase?" he mumbled. Then he became excited. "Why, a man just stepped out of here—" He turned to look down the street. "That's him." The dumpy man I'd seen was walking off Julia's bag in his right hand, mine in his left. He seemed in no hurry. "Hey!" I shouted, starting toward him. abreast an old gray, mud-spattered coupe, ran around, opened the door and threw both bags into the rear seat as he got in. The car was a hundred feet away and gathering speed by the time I reached where it had been parked. I watched it for a moment, then walked back to the entranceway where Julia was standing with the redcap, who said, "That man steal them suitcases?" "That he did," I said. The policeman was sympathetic and concerned. He said, "We'd better get over to the office." But we never left the spot because an explosion some blocks distant shattered the air. Julia's hand grasped my arm. Hard. We stood there. I could visualize the wreckage of an old gray coupe in the middle of a street, but I couldn't visualize the driver. That was all right. I didn't want to see him. I didn't know what Julia was thinking. She said, "About those bags," and looked at me.

<question>:
How did the bomb get in Julia's suitcase?

<options>:
A Julia's sister slipped the bomb inside the suitcase before she left for the airport.
B Julia put the bomb in her suitcase before she left home.
C A terrorist at the airport grabbed Julia's bag at random and slipped the bomb inside.
D Julia's husband put the bomb in her suitcase before she left the house.

<answer>:

D