“When I grow . . . . . . . ., I’m going to travel all over the world,” the little girl said. A. to B. in C. up D. above

The correct answer is to.

The little girl is saying that she will travel to different parts of the world when she grows up. The word “to” is used to indicate a destination or goal. In this case, the little girl’s goal is to travel all over the world.

The other options are not correct because they do not make sense in the context of the sentence. The word “in” is used to indicate a location or position. The word “up” is used to indicate movement in a vertical direction. The word “above” is used to indicate a position that is higher than something else.

In conclusion, the correct answer is to. The little girl is saying that she will travel to different parts of the world when she grows up.