Read the passage below carefully, and then choose the best answer:
Inside the Mind of a Sushi Legend
During our lives, it is likely we will have not one, but several careers. People change jobs due to boredom, to earn more money, or because they want to experience more from life. Although this certainly brings variety to life, it also prevents workers from achieving mastery in their craft. This is what makes Sukiyabashi Jiro so incredible. For the past 75 years, he was dedicated his life to one goal: perfecting his technique so that he can make the world’s best sushi. In the documentary Jiro: Dreams of Sushi, viewers get a peek inside the life of this genius. For Jiro, who owns a three-star Michelin restaurant, sushi is not simply taking raw fish, vinegar, and rice, and arranging them together. He insists that every detail must be perfect. Watching him at work is similar to seeing an artist in action. Yet, the true key to his success is not creative imagination: it’s his dedication and repetition. Jiro has kept the same daily schedule for decades. As he goes about his tasks, he always searches for small ways to improve his craft. Jiro won’t accept anything less than the best. He has committed to using only the freshest ingredients, and he’ll do whatever it takes to get them. This means heading down to the local fish market daily to purchase fish which has just been caught that day. Jiro only deals with the top fish dealer, who is also a master of his trade. This seller reserves only the best of the best for Jiro, which Jiro inspects closely before making his choices. Back at the shop, the sushi rice is also prepared with delicate care. If he senses something is not up to standards, he will have his employees trash it and start all over again. At the age of 85, Jiro is aware that he won’t be able to continue making sushi forever. Therefore, he has been training his two middle-aged sons for many years to learn his techniques and philosophies. His eldest son, Yamamoto, works side-by-side with Jiro to this day. His younger son, Takashi, has opened his own sushi restaurant elsewhere in Tokyo. In the film, both sons discuss how difficult it is to live up to their famous father’s expectations and match his rigorous work ethic. To learn more about Jiro and his methods, be sure to catch this fascinating film.
3. What does the word “_them_” in paragraph 2 refer to?