阅读下面材料，从每题所给的A、B、C、D四个选项中，选出符合材料意思的最佳选项。

    The BFG 《圆梦巨人》is a new film. It is about the Big Friendly Giant (巨人). He lives with nine other bad giants in Giant Country. Every night the nine bad giants eat people, but the BFG doesn't. He only eats vegetables and collects dreams (收集梦想) for children.

    One day, the BFG meets a nice girl in London. Her name is Sophie. She is 10 years old. Sophie has no parents, so he takes her back to his home. Sophie is not happy at first. She wants to run away. But when she gets to know the BFG, they become (成为) good friends. They have fun in the giants' world.

    But other giants soon know about Sophie and they want to eat children in London. Sophie and the BFG find the Queen of England (英国女王) and tell(告诉) her about this danger. At last, the Queen, Sophie and the BFG beat (打败) the bad giants.

已知函数f（x）=πcos（$\frac{x}{4}+\frac{\mathrm{\pi }}{3}$），如果存在实数x₁、x₂，使得对任意实数x，都有f（x₁）≤f（x）≤f（x₂），则|x₁﹣x₂|的最小值是（　　）