Answer: Between
Step-by-step explanation:
The appropriate preposition to fill in the blank in the sentence "There's a rift ___ these two kids" is "between."
The word "between" is used to indicate a separation or division between two people or things. In this context, it suggests that there is a disagreement or conflict between the two kids.
Example: "There's a rift between Jack and Jill because they have different opinions on how to complete the project."
While the preposition "among" is also used to indicate a relationship between multiple people or things, it is generally used when referring to three or more individuals or objects.
Example: "There's a rift among the members of the team because they cannot agree on a strategy."
Therefore, in the given sentence, "between" is the appropriate preposition to convey the idea of a rift or disagreement between the two kids.