Read the following article and select the best answer. Article: At noon the rush hour had passed. There were few guests in the snack bar. It was not crowded. When the boss was about to take a break to read a newspaper, in came an old lady and a little boy. "How much money is a bowl of beef soup?" the grandma sat down, counted the money in her purse and ordered a bowl of beef soup. The grandma pushed the bowl to the little boy, who swallowed his saliva , looking at his grandma and saying, "Grandma, did you really have lunch?" "Of course." His grandma chewed a piece of radish slowly. Very quickly, the little boy ate up the meal. Seeing this. the boss went over to them and said, "Old lady, congratulations, you are lucky to have the free food, for you are our 100th guest." Afterwards, over a month or more, one day, the small boy squatted across the snack bar, where he seemed to be counting something, which shocked the boss when he happened to look out office window. When the small boy saw a guest walk into the snack bar, he would put a small stone into the circle he drew, but the lunch time had almost passed, the small stones he put into the circle were hardly 50. The boss was quite worried and called up all his old guests. The guests started coming one after another. "81, 82, 83... " the small boy counted faster and faster. At last, when the 99th small stone was put into the circle, the little boy hurried to pull his grandma's hand and went into the snack bar. "Grandma, this time it's on me," the little boy said proudly. The grandma who had become the real 100th guest was served a bowl of beef soup by her grandson. As his grandma as before, the little boy chewed a piece of radish in his mouth. Question: Grandma ordered only one bowl of beef soup because _ . - Grandma only liked radish - Grandma didn't like beef soup - Grandma loved her grandson more than herself - There was only one bowl of beef soup left in the snack bar at that time
A:
Grandma loved her grandson more than herself