cyang33/LingGym huggingface dataset:
Question 123:
You are a linguist specializing in Rapa Nui. You are given a sentence along with its morpheme breakdown, gloss, and translation. Words are separated by spaces, and morphemes are separated by hyphens. However, a word and its gloss are missing and represented by an underscore. Based on your understanding, please choose the most appropriate option. 
Sentence (with missing item): He uru mai te e\ꞌa, he to\ꞌo i tau poki era. He ___ tau poki era.
Gloss (with missing item): NTR enter hither ART wave NTR take ACC DEM child DIST PRED ___ DEM child DIST
The English translation of this sentence is:‘A wave came in and took the child. The child (became) a fish.’
Here is a relevant knowledge point for this example, with the related morphemes and glosses masked: As \REF{ex:9.107} shows, the verb riro has two arguments: the subject tū poki era and a he\is{he (nominal predicate marker)}{}-marked noun phrase expressing the class to which the subject belongs after the transformation. Apart from the verb, the clause has the same structure as the verbless classifying clause\is{Clause!classifying} in \REF{ex:9.106}. This shows that riro is a true copula verb, linking two noun phrases with an identity relation. Two more examples of the same construction:
A: word: siera	 gloss: sawfish
B: word: repa	 gloss: young_man
C: word: ika	 gloss: fish
D: word: vivika	 gloss: Vivika
Please only return the letter (A–D). Do not say anything else.
Correct Answer: C