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

<passage>:
My sister and I have been going through my father's estate lately with his lawyer, and we're pawing through old, dusty files to find bank account numbers and rules for annuities, so maybe it's a good time to think about what my father, Herbert Stein, left to us. They never had live-in help. My father washed the dishes after my mother made the meatloaf. My father took the bus whenever he could. His only large expenditure in his and my mom's whole lives was to pay for schools for his children and grandchildren. He never bought bottled, imported water Long after, when Nixon was blasted as an anti-Semite, my father told in print and in person of the Nixon he knew: kind "Loyalty." There is no item for it in the inventory of estate assets to be taxed. My father lived his life, especially in the latter years of it, in a haze of appreciation. Whatever small faults he could and did find with America, he endlessly reminded anyone who listened that the best achievement of mankind was America, whose current failings were trivial by historic standards, which was in a constant process of amelioration, and which offered its citizens the best chance in history for a good life. When he did consider the failures of American life in the past, especially institutionalized racism, he did so to note the astonishing progress that had been made in his lifetime. He had no use for those who held up a mirror of fault-finding from the left or the right when he could see in his own era what vast improvements in freedom had been made for blacks, Jews, women, Asians, Hispanics, and every other minority. This quality of gratitude for America and for the beauty of life cannot be taxed, at least not so far. He appreciated his friends and did not differentiate between them on the basis of fame or position. He took the words of his longtime pal Murray Foss at the American Enterprise Institute, a think tank where he hung his hat for many years, into account My father's stance against seeking money for its own sake--so wildly unsuited to today's age, but so reassuring to his children--cannot be taken by the Treasury. Once, about 25 years ago, when my boss treated me unfairly, my father said that if it happened again, I should quit and he would take care of me until I found a job. I never needed to do it, but the offer hung in my mind as a last refuge forever. This reassurance--that somehow things will be all right, that there is a lot of ruin in a man, as well as in a nation, to paraphrase his idol, Adam Smith--has become part of me, and I can still summon it up when I am terrified because of a huge quarterly tax payment due or a bad day on the market. Again, the IRS taxes it at zero. My father himself, as far as I know, inherited no money at all from his father. He did inherit a belief that hard work would solve most problems, that spending beyond one's means was a recipe for disaster, that flashy showoff behavior with borrowed money was understandable but foolish. He did inherit enough common sense to tell his son that buying property he would never live in was probably a bad mistake. (He rarely spoke in moral absolutes. He believed instead that humans could and would make individual choices but that there were surely consequences to those choices that could be considered.) He passed these beliefs on to me, although they have become somewhat attenuated by my 20-plus years in the fleshpots of Hollywood. Still, I am one of the only men I know here who has never been drastically short of money (so far), and that I attribute to hearing his rules of prudence. Most of all, my father believed in loving and appreciating those persons close to him. He stayed close to all his pals from the Nixon days (and would not hear personal criticism of Pat Buchanan, who had been a friend and colleague, although he was bewildered by Pat's stands on many issues). He basked in the pleasure of the company of his colleagues and friends at the American Enterprise Institute, which he thought of as one of his three homes--the Cosmos Club and his extremely modest but well-situated apartment at the Watergate were the others. He could form attachments readily. Even in his last days in the hospital, he took a liking to a Ukrainian-born doctor and used to refer to him as "Suvorov," after the Russian general written of glowingly in War and Peace-- which still sits on the table next to his reading chair, with his notes on little pieces of paper in it. He grieved like a banshee when my mother died in 1997 and never really got over the loss of a soul mate of 61 years, who literally dreamed the same dreams he did. Once, he wrote my mother a poem (which he called "Route 29") about the beauty of Route 29 north of Charlottesville, Va., and the pleasure of riding along it with my mom. He filed it away for further work and never touched it again. The day after my mother's death, he found it--with her reply poem telling of how she hoped to never see those hills and those clouds and those cattle with anyone else but Pop. She had written her poem (which she titled "Only You") and put it back in the file without ever telling him. He survived that terrible loss with the help of a beautiful widow, whom he also came to appreciate and live for. He probably spent more time trying to help her with an annuity problem than he ever did on any financial feature of his own life. A simple call from her inviting him to dinner in her kitchen on Kalorama Circle was enough to make his life complete. Even in his hospital bed, hearing my son's voice on the phone could make him smile through the fear and the pain. ("He sounds so sweet when he calls me 'Grandpa,' " my father said, beaming even with tubes in him.) Never once did my sister or I ever ask him for help that he hesitated, let alone declined, to give. Usually this was some research we were too lazy to do, but which he did without any resistance at all. When I was a child and had a chore like leaf raking that I didn't want to do, his simple answer was to say, "Let's do it together. It'll take half as long." I use that with my son almost every day, along with the devotion, and my father's example about his friends from long ago to make my life work. He stayed close with friends from Williams College Class of '35, especially Richard Helms of the CIA. He had lunch with one of his pals from Williams, Johnny Davis, class of '33, who got him a job as a dishwasher at Sigma Chi, days before he went into the hospital. This quality of devotion and the rewards I get from it are worth far more than any stocks or bonds in my father's estate--and cannot be taken away at the marginal rate of 55 percent. Plus, I can pass it on to my son without any generation-skipping surcharge. And he left something else of perhaps even greater value: a good name. Many people quarreled with my father's ideas about taxes or about when to balance the budget. He faced frequent opposition to his belief in a large defense budget. Of course, most of the people he knew disagreed with him about RN. But no one ever questioned that he came by his views honestly, by means of research and analysis and sometimes sentiment, but not for any venal reason or by the process of money changing hands. His reputation for honesty was simply without a speck of question upon it.

<question>:
Why did the author's father always assist him when he asked?

<options>:
A He knew he asked because he wanted his father to feel needed
B He knew he wasn't capable on his own
C He knew he was lazy
D He wanted him to feel supported

<answer>:

D