没有答案是因为
你忘了逗号……
应该是 __ they have gathered,plants produce the beautiful flowers,the delicious fruits,
out of 后面应该直接加名词,object direct,但是they have gathered不是
而第二个选择 out of what 里面what 就是他们gather 的东西
所以应该是B
out of what they have gathered,plants produce the beautiful flowers,the delicious fruits,and the golden grain.
从他们收集的东西里面,植物产出了美丽的花,美味的水果和金色的麦子.