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

<passage>:
that will bear food and be a home for our children. And perhaps most important of all, they'll make other men think of the stars and look up at them and feel humility—for mankind needs humility." He's already reached Mars and Venus. Let him leave Jupiter and the That was something I didn't have to worry about. My parents had died in a strato-jet crash when I was four, so I hadn't needed many of those "You are cordially invited" cards. Just one, which I'd sent to Charlie Taggart. Stardust Charlie, we called him, although I never knew why. He was a veteran of Everson's first trip to the Moon nearly twenty-five years ago, and he was still at it. He was Chief Jetman now on the me until he became father, mother, and buddy all in one to me. And I remembered, too, how his recommendation had finally made me a cadet. My gaze wandered over the faces, but I couldn't find Charlie's. It It doesn't matter Then Mickey stiffened. "I see 'em, Ben! There in the fifth row!" At last it was over, and the proud faces descended upon us in a huge, babbling wave. Then I saw him. Good old Stardust Charlie. His wizened little body was shuffling down an aisle, his eyes shining like a child's. He'd been sandwiched, evidently, in one of the rear it was hard to believe he'd once been young. He scratched his mop of steel-gray hair and grinned. "You made it, boy," he chortled, "and by Jupiter, we'll celebrate tonight. Yes, siree, I got twenty-four hours, and we'll celebrate as introduction of Charlie. You and Mickey looked strangely at Charlie, and I realized that old Stardust was not a cadet's notion of the ideal spaceman. Charlie scorned the skin-tight uniforms of the government service and wore a shiny black suit that was a relic of Everson's early-day Moon Patrol. You were kind. You shook hands and said, softly: "It's a privilege to meet you, Charlie. Just think—one of Everson's men, one of the first to reach the Moon!" weekend with us, aren't you, Ben?" I shook my head. "Charlie has only twenty-four hours liberty. We're "Why don't you both come with us?" you asked. "Our folks have their Charlie, wouldn't you like a home-cooked meal before going back to the Moon?" that he'd infinitely prefer to spend his liberty sampling Martian fizzes and Plutonian zombies. But this night seemed too sacred for Charlie's kind of celebration. "Ben," he called, "don't forget that offer. Remember you've got two "No, thanks," I answered. "Better not count on me." A moment later Mickey said, frowning, "What was he talking about, Ben? Mickey looked down at his feet. "I didn't want to tell you yet, Ben. so exciting. I'll just live a lot longer. I'm sorry, Ben." "It doesn't change anything, Ben—right now, I mean. We can still have video, and a handsome automatic home that needed no servants or housework. Stardust Charlie was as comfortable as a Martian sand-monkey in a shower, but he tried courageously to be himself. At the dinner table he stared glassily at nothing and grated, "Only hit streaked up from White Sands. We gazed for a few seconds up into the dark sky, and then you said: "Charlie is funny, isn't he? He's nice and I'm glad he's here, but he's sort of funny." "He's an old-time spaceman. You didn't need much education in those "But he wasn't always a spaceman. Didn't he ever have a family?" I smiled and shook my head. "If he had, he never mentioned it. Charlie doesn't like to be sentimental, at least not on the outside. As far as I know, his life began when he took off for the Moon with Everson." in a Moon crash at the age of 36, or like a thousand others who lie Charlie—a kind of human meteor streaking through space, eternally alone, never finding a home. Or there's the other path. To stay on this little prison of an Earth leavin' that for you. It's full of old stuff, souvenirs mostly. Thought maybe you'd like to have 'em." I scowled, not understanding. "Why, Charlie? What for?" He shrugged as if afraid he might be accused of sentimentality. "Oh, Some of these days, I won't be so lucky." I tried to laugh. "You're good for another twenty-five years, Charlie." gonna get off the Shuttle this time, make one more trip to Mars. Tell We watched him leave, you and Mickey and I. "When will you be back?" you asked. Charlie's hard face contorted itself into a gargoylish grin. "Maybe a couple of months, maybe a couple of years. You know spacemen." gone. "What's the matter, Ben? Still sore? I feel like a heel, but I'm just "Well, how about staying with us till you decide? Might as well enjoy Why must I make a choice? Why can't I have both Then you murmured, "I—I want to marry you, Ben, but are you asking me to marry a spaceman or a teacher?" "Can't a spaceman marry, too?" Ben? You'd be like Charlie. Gone for two have to be a spaceman forever. I could try it for a couple of years, you want to go on to Jupiter and Saturn and Uranus and on and on?" "Do you think I'd dare have children, Ben? Mickey told me what happened You can't stay here. You've You can take Dean Dawson's job and stay with Laura and have kids and a line in a history book. I cursed. I knew what Charlie would say. He'd say, "Get the hell out of there, boy. Don't let a fool woman make a sucker out of you. Get out there on the I stood staring at the cylinder. Charles Taggart was dead. Charles Taggart was Charlie. Stardust Charlie. My heart thudded crazily against my chest. It couldn't be! Not Charlie! The audiogram had lied! You ran to it, shut it off. "I'm sorry, Ben, so terribly—" photos, some letters, a small black statue of a forgotten Martian god, a gold service medal from the Moon Patrol. This was what remained of Charlie after twenty-five years in space. It was a bitter bargain. A statue instead of a wife, yellowed letters instead of children, a medal instead of a home. Charlie sensed my indecision, that he left these things so that they Charlie was young once, his eyes full of dreams, and he faced the same decision that I am facing. Two paths were before him, but he tried to travel both. He later learned what we already know—that there can be no compromise. And you know, too, which path he finally chose. Do you know why he had to drug himself to watch me graduate? So he could look at me, knowing that I would see the worlds he could never live to see. Charlie didn't leave just a few trinkets behind him. He left himself, Laura, for he showed me that a boy's dream can also be a man's dream. why he wanted to reach Mars? Do you know why he didn't be lonely when men like Charlie roam the spaceways? Charlie wanted me to himself that night after graduation. He wanted us to celebrate as spacemen should, for he knew that this would be his last night on Earth. It might have seemed an ugly kind of celebration Space Rat , just off Chandler Field on the Grand Canal. Stardust Charlie will be there he'll go with me in memory to whatever part of the Galaxy I may live to reach. And so will you, Laura. I have two wedding rings with me—his wife's ring and yours.

<question>:
Why did Ben leave with two rings?

<options>:
A to symbolize the life he's giving up
B to represent his marriage to Luna
C to remind him to come home and get married
D to honor Stardust Charlie

<answer>:

A